They squirm like that chap Leslie (7)

I believe the answer is:

gentles

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'they squirm like' is the definition.
The definition suggests an adverb but the answer is not.

'chap leslie' is the wordplay.
'chap' becomes 'gent' (both can mean a man).
'leslie' becomes 'les' (short for Leslie).
'gent'+'les'='GENTLES'

'that' acts as a link.

Can you help me to learn more?

(Another definition for gentles that I've seen is " Maggots used as bait".)

I've seen this clue in the Evening Standard.

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