There was a wicket within the second over of the day to get Middlesex going as makeshift opener George Balderson was undone by a Higgins supply that nipped again to have him lbw for eight.
Jennings and Josh Bohannon then mixed to placed on 56 – in what turned out to be the best partnership of the innings – though the bowling remained tight.
However Higgins returned for his second spell and struck along with his first ball as Bohannon tickled it behind for 20.
There was then a giant third wicket earlier than lunch as Australia batter Marcus Harris (5) was deceived by a ball outdoors off-stump and scooped it to mid-on the place Naavya Sharma took an excellent, low diving catch to depart the hosts 74-3.
Solely 4 extra runs have been added earlier than lunch and after the interval, Jennings introduced up his third half-century in 5 innings off 107 balls as Lancashire appeared to rebuild.
However Michael Jones was cleaned up by a beautiful supply from teenager Morgan to make it 115-4 to go for 27 and that grew to become 128-5 as a frantic innings from Matty Hurst (seven) ended with him providing a easy catch to fourth slip off Sharma.
Inexperienced joined Jennings on the crease and whereas the abroad participant was dropped on 13, Middlesex claimed the prize scalp when Roland-Jones produced a advantageous ball that Jennings nicked behind to depart the hosts in hassle at 151-6.
Whereas solely 13 runs later, Tom Hartley was caught behind for 3 to present Higgins his third wicket.
Dangerous mild produced an early tea earlier than the final rites of Lancashire’s innings have been performed out as Tom Bailey fell for 11, Mitch Stanley was clear bowled by Roland-Jones for one and Inexperienced was final man to fall, bowled by Morgan because the 18-year-old completed with advantageous figures of 3-41.
