Will fetch, you understand (7)

I believe the answer is:

realise

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'understand' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for realise that I've seen before include "Discover" , "Come to understand - see liar (anag)" , "appreciate" , "Turn into cash; come to see" , "Come to be aware" .)

I've seen this clue in the Evening Standard.

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