The old Society? Absolutely (3)
I believe the answer is:
yes
'absolutely' is the definition.
(both can be used to give an affirmative answer)
'the old society?' is the wordplay.
'the old' becomes 'ye' (resembles a historical spelling of 'the').
'society?' becomes 's' (common abbreviation in names of organisations).
'ye'+'s'='YES'
(Other definitions for yes that I've seen before include "Affirmative reply" , "Word of affirmation" , "Pro vote" , "Yea" , "Of course" .)