Squirm like a man after a summons? (6)
I believe the answer is:
writhe
'squirm' is the definition.
(synonyms)
'a man after a summons?' is the wordplay.
'a man' becomes 'he' (pronoun for a man).
'after' means one lot of letters go next to another.
'a summons?' becomes 'writ' (summons is a kind of writ).
'he' put after 'writ' is 'WRITHE'.
'like' is the link.
(Other definitions for writhe that I've seen before include "Squirm in pain" , "It's painful moving" , "Move sinuously" , "Twist in agony" , "Wriggle" .)