Without a light, but won't be beaten (9)
I believe the answer is:
matchless
'without a light' is the definition.
('light' can be 'match' (match is a kind of light) so maybe 'without a light' can be ''matchless')
'won't be beaten' is the wordplay.
I cannot quite see how this works, but
'be' could be 'match' (matching is a kind of being) and 'match' is present in the answer.
The remaining letters 'less' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'but' acts as a link.
Can you help me to learn more?
(Other definitions for matchless that I've seen before include "Like the top" , "Unrivalled" , "Unique" , "team without a fixture" , "Having no equal" .)