Picture that's a match! (4)

I believe the answer is:

snap

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

'picture' is the definition.
(I know that snap is a type of picture)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for snap that I've seen before include "Crack; bite" , "Break sharply like dry twig" , "Bite at or utter angry words" , "Break suddenly and cleanly" , "Spell of cold weather and card game" .)

I've seen this clue in The Sun.

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