Crossword Genius

Squirm as you scribble out a letter (6)

Ross

I believe the answer is:

writhe

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'squirm' is the definition.
(synonyms)

'you scribble out a letter' is the wordplay.
'you scribble' becomes 'write' (I can't justify this - if you can you should give a lot more credence to this answer).
'out' means one lot of letters goes inside another.
'a letter' becomes 'h'.
'write' going around 'h' is 'WRITHE'.

'as' acts as a link.

Can you help me to learn more?

(Other definitions for writhe that I've seen before include "Thrash" , "Squirm in pain" , "6, maybe in agony" , "Twist in agony" , "Painfully move" .)

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