Bit more than seven, say (3)
I believe the answer is:
ate
'bit' is the definition.
('bite' can be similar in meaning to 'eat')
'more than seven say' is the wordplay.
'more than seven' becomes 'eight'.
'say' shows a homophone (sound like).
'eight' sounds like 'ATE'.
(Other definitions for ate that I've seen before include "mischief-maker" , "Munched" , "Had at meal" , "Greek goddess of mischief" , "Tea (anag.)" .)