Crossword Genius

Catch on, realise (4)

Ross

I believe the answer is:

twig

I believe this clue is a double definition.

'catch on' is the first definition.
(synonyms)

'realise' is the second definition.
(I know that twig is a more specific form of realise)

(Other definitions for twig that I've seen before include "Suddenly realise" , "Small part of a branch - suddenly understand" , "Eventually grasp" , "A little stick" , "Suddenly see; branchlet" .)

I've seen this clue in The Times.
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