Large amount on a pension, perhaps, worked hard (8)
I believe the answer is:
massaged
'worked hard' is the definition.
(to massage is to press or work hard)
'large amount on a pension perhaps' is the wordplay.
'large amount' becomes 'mass' (I've seen this in another clue).
'on a pension perhaps' becomes 'aged' (as in an old-age pension).
'mass'+'aged'='MASSAGED'
(Other definitions for massaged that I've seen before include "given physiotherapy?" , "Rubbed, manipulated" , "Statistically manipulated" , "cooked" , "relieved tension, in a way" .)