Crossword Genius

Squirm and wither tormentedly (6)


I believe the answer is:


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Here is my best explanation:

'squirm' is the definition.

'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