Fair, also, which is to the good (4,2,4)

I believe the answer is:

just as well

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'is to the good' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'fair also' is the wordplay.
'fair' becomes 'just' (Synonym).
'also' becomes 'as well' (synonyms).
'just'+'aswell'='JUST AS WELL'

'which' is the link.

Can you help me to learn more?

(Other definitions for just as well that I've seen before include "A good thing" , "Fortunate" , "desirable!" .)

I've seen this clue in the Evening Standard.

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