Veteran playing eg at Lords (3,6)
I believe the answer is:
old stager
'veteran' is the definition.
('old stager' can be a synonym of 'veteran')
'playing eg at lords' is the wordplay.
'playing' indicates an anagram.
'eg'+'at'+'lords'='egatlords'
'egatlords' anagrammed gives 'OLD STAGER'.
(Other definitions for old stager that I've seen before include "expert" , "veteran" , "One who's experienced a lot" , "senior citizen" .)