All in? Absolutely (5,4)
I believe the answer is:
every inch
'absolutely' is the definition.
Both the answer and definition are adverbs. Maybe you can see an association between them that I don't see?
'all in?' is the wordplay.
'all' becomes 'every' (similar in meaning).
'in?' becomes 'inch' ('inch' can be a synonym of 'in').
'every'+'inch'='EVERY INCH'
Can you help me to learn more?
(Other definitions for every inch that I've seen before include "Thoroughly" , "Wholly" , "In all departments" , "Absolutely!" , "Entirely" .)