A second fight about lighter (7)
I believe the answer is:
rematch
'a second fight' is the definition.
The definition suggests a singular noun which matches the answer.
'about lighter' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'lighter' becomes 'match' (match is a kind of lighter).
're'+'match'='REMATCH'
Can you help me to learn more?
(Other definitions for rematch that I've seen before include "Later encounter" , "Teams' second game" , "Another game" , "Return game" , "new bout" .)