Fair, fair love in the Lord (6,4)

I believe the answer is:

pretty good

'fair' is the definition.
(thesaurus)

'fair love in the lord' is the wordplay.
'fair' becomes 'pretty' (I've seen this before).
'love' becomes 'o' (love means zero in tennis).
'in' means one lot of letters goes inside another.
'the lord' becomes 'god' (the Lord can mean God).
'o' inserted within 'god' is 'good'.
'pretty'+'good'='PRETTY GOOD'

I've seen this clue in The Guardian.

Want a hint initially instead of a full solution? Install my app