Crossword Genius

Use love where Christians place trust? (4)

Ross

I believe the answer is:

good

I'm a little stuck... Click here to teach me more about this clue!

'use' is the definition.
(thesaurus)

'love where christians place trust?' is the wordplay.
I cannot really see how this works, but
'love' could be 'o' (love means zero in tennis) and 'o' is present in the answer.
The remaining letters 'god' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for good that I've seen before include "Enjoyable -- moral" , "and 22 Down and 14 Across: Christmas carol" , "Moral excellence" , "Priestley's companions" , "Having desirable qualities" .)

I've seen this clue in The Telegraph.
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