A good deal may come of it (10)
I believe the answer is:
timberyard
'a good' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see a link between them that I can't see?
'deal may come of it' is the wordplay.
I cannot really see how this works, but
'deal' could be 'timber' (I've seen this before) and 'timber' is located in the answer.
The remaining letters 'yard' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for timberyard that I've seen is " supplier of building materials".)