No peer and no lighter? (9)
I believe the answer is:
unmatched
'no' is the definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I don't see?
'peer and no lighter?' is the wordplay.
I cannot quite see how this works, but
'peer' could be 'match' (synonyms) and 'match' is present in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for unmatched that I've seen is " single".)