Crossword Genius

Squirm and wither tormentedly (6)

Ross

I believe the answer is:

writhe

I'm a little stuck... Click here to teach me about this clue!

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