Maintain senior was usually around? (8)
I believe the answer is:
averaged
'was usually around?' is the definition.
(to average is to be around a certain figure)
'maintain senior' is the wordplay.
'maintain' becomes 'aver' (averring is a kind of maintaining).
'senior' becomes 'aged' (synonyms).
'aver'+'aged'='AVERAGED'
(Other definitions for averaged that I've seen before include "Found mean" , "having done statistical calculation" , "developed mean values" .)