Look at overgrown garden (6)

I believe the answer is:

gander

I'm a little stuck... Click here to teach me more about this clue!

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

'overgrown garden' is the wordplay.
'garden' can be anagrammed to 'GANDER'.
However, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for gander that I've seen before include "glance" , "Glimpse" , "Male goose - quick look" , "He has webbed feet" , "Ranged about with male goose" .)

I've seen this clue in The Mirror.

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