Squirm and wither tormentedly (6)
I believe the answer is:
writhe
Here is my best explanation:
'squirm' is the definition.
(synonyms)
'wither tormentedly' is the wordplay.
'wither' can be anagrammed to 'WRITHE'.
Though, I am unsure how this is indicated.
'and' is the link.
Can you help me to learn more?
This clue was last seen in Evening Standard