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What a mousetrap has to be

Ross

I believe the answer is:

set

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'be' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'what a mousetrap has' is the wordplay.
'has' says the answer is hidden in the clue.
'SET' can be found hidden inside 'what mousetrap'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for set that I've seen before include "group usually found together" , "conventional" , "Major division of tennis match" , "Place - become rigid - adjust - group of tennis games - fixed - clique - fall beneath the horizon" , "Hard; place" .)

I've seen this clue in the Evening Standard.
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