Crossword Genius

Evidence that's found in pudding? (5)

Ross

I believe the answer is:

proof

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

This could be a double definition.

'evidence' is the first definition.
(evidence proves something)

'found in pudding?' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for proof that I've seen before include "Draft copy of printed text" , "Render impervious (to)" , "Body of evidence" , "Trial printing" , "to give a watertight case?" .)

I've seen this clue in The Sun.
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