Being scrupulously just (2,3,8)

I believe the answer is:

in all fairness

'being scrupulously just' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for in all fairness that I've seen before include "Being balanced" , "being scrupulously even-handed" .)

I've seen this clue in The Telegraph.

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