One bashed in legs (6)
I believe the answer is:
single
'one' is the definition.
(similar in meaning)
'bashed in legs' is the wordplay.
'bashed' indicates an anagram.
'in'+'legs'='inlegs'
'inlegs' is an anagram of 'SINGLE'.
(Other definitions for single that I've seen before include "Unattached" , "Individual - unmarried" , "Sole" , "Just one - on one's own" , "Concentrating on only one aim" .)