Equal to (2,1,3,4)

I think it could be either:

Which length description are you looking for?:

2,1,3,4

10*

on a par with

'equal to' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for on a par with that I've seen before include "Matching" , "Equal to" .)

I've seen this clue in The Mirror.

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