Not all squirms can be attributed to these! (5)

I believe the answer is:

worms

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'not all squirms' is the definition.
'worms' can be an answer for 'squirms' ('worm' can be a synonym of 'squirm'). I'm unsure of the 'not all' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for worms that I've seen before include "harmful programs" , "Early birds' diet" , "despicable people" , "Long soft-bodied limbless invertebrates" , "Where reformer was condemned" .)

I've seen this clue in the Evening Standard.

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