Look happy when getting fresh limes (5)

I believe the answer is:

smile

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

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

'getting fresh limes' is the wordplay.
'limes' anagrams to 'SMILE'.
However, I am unsure how this is indicated.

'when' acts as a link.

Can you help me to learn more?

(Other definitions for smile that I've seen before include "Friendly facial gesture" , "Show amusement or pleasure" , "Pleased expression" , "Show pleasure in slime" , "Visually express amusement" .)

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