Check age and name for old-timer (7)
I believe the answer is:
veteran
'old-timer' is the definition.
(thesaurus)
'check age and name' is the wordplay.
'check' becomes 'vet' (I've seen this before).
'age' becomes 'era' (I've seen this before).
'and' is a charade indicator (letters next to each other).
'name' becomes 'n' (common abbreviation e.g. on forms).
'vet'+'era'+'n'='VETERAN'
'for' acts as a link.
(Other definitions for veteran that I've seen before include "Long-serving" , "Old campaigner" , "An old hand or ex-soldier in USA" , "Describing a pre-1905 car (or pre-1919 at a pinch?)" , "Nervate (anag.)" .)