Crossword Genius

Cotton on sticky part of plant (4)

Ross

I believe the answer is:

twig

I believe this is a double definition.

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

'sticky part of plant' is the second definition.
(stick-like part of a tree)

(Other definitions for twig that I've seen before include "bit of stick" , "Tiny end of branch" , "Suddenly realise" , "Cotton on - small branch" , "Suddenly catch" .)

I've seen this clue in The Independent.
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