What’s up, old battered fighter? (8)
I believe the answer is:
southpaw
'fighter?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'what's up old battered' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'battered' indicates an anagram.
'whats'+'up'+'o'='whatsupo'
'whatsupo' with letters rearranged gives 'SOUTHPAW'.
Can you help me to learn more?
(Other definitions for southpaw that I've seen before include "Left-handed fighter" , "One using left hand" , "Left-hander" , "Boxer who leads with the right hand" , "Left-handed person, especially a boxer" .)