Tried, with "at" (3,1,2)

I think it could be either:

Which length description are you looking for?:

3,1,2

had a go

'tried with at' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for had a go that I've seen before include "Tried" , "Made an attempt" .)

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