Score with the cryptic clue for "tray" (7,1,3)

'score with the cryptic clue' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'tray' is the wordplay.
I cannot really see how this works, but
an anagram of 'tray' is 'atry' which is present in the answer.
The remaining letters 'convert' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

'for' acts as a link.

Can you help me to learn more?