Show your teeth! (5)

I believe the answer is:

smile

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

'show' is the definition.
(I know that smile is a more specific form of the action show)

I don't understand the remainder of the clue.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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