Leicestershire 155 (Gleeson 6-43) and 40 for 0 (Horton 30*) lead Lancashire 170 (Croft 44, Mike 3-41) by 25 runs
Leicestershire's bowlers needed just 47.3 overs to bowl Lancashire out after play finally got underway on the third day of the Specsavers County Championship match at the Fischer County Ground.
Overnight rain on an already sodden outfield - no play at all had been possible on day two - meant it was 2pm before the umpires decided the ground was fit for play, with a possible 59 overs to be bowled.
Lancashire had moved from their overnight score of 2 for 1 to 20 for 1 when Alex Davies edged a Dieter Klein delivery low to second slip, where Colin Ackermann held a neat low catch.
Liam Livingstone had made 10 when a fine out-swinger from Ben Mike found the edge and wicket-keeper Harry Swindells dived to his right to take the catch. Mike was finding more movement than any other bowler, and Rob Jones was clearly anticipating plenty of out-swing when he left a delivery which pitched on off and duly thumped into the top of off stump.
Josh Bohannon played well in going to 20 but was drawn into playing an airy drive at another Mike out-swinger, succeeding only in edging a catch to Paul Horton at first slip, and the champions were reduced to 77 for 6 when captain Dane Vilas also played a head-up drive at a delivery from Klein that swung back, beat the bat and hit middle stump.
Tom Bailey then chipped a straight delivery from Wright towards mid-on, and 12th man Arron Lilley threw himself forward to get his hands under the ball just before it hit the ground.
Liam Hurt, on his first-class debut, joined Steven Croft in adding 60 for the eighth wicket before Croft drove at Klein and Leicestershire captain Horton took a fine catch diving low to his right at first slip.
The Foxes' left-arm spinner Callum Parkinson then took revenge on his twin brother Matt when he trapped him leg before wicket - appropriately enough, the self-same dismissal inflicted by Matt on Callum in Leicestershire's first innings.
Parkinson then ended Hurt's knock in exactly the same manner, before Horton and Hassan Azad put together an untroubled and unbroken partnership of 40 for the opening wicket when the Foxes began their second innings.