Cotton on (4)

I think it could be either:

Which length description are you looking for?:

twig

'cotton on' is the definition.
(both can mean to realise something)

This is the entire clue.

(Other definitions for twig that I've seen before include "Latch on" , "Only a minor branch" , "Finally understand" , "Small piece of tree" , "Small part of tree - suddenly understand" .)

I've seen this clue in The Times and The Sunday Times.

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