Past constitution of Goa (3)
I believe the answer is:
ago
'past' is the definition.
(similar in meaning)
'constitution of goa' is the wordplay.
'constitution of' indicates anagramming the letters (I've seen 'constitution' mean this).
'goa' is an anagram of 'AGO'.
(Other definitions for ago that I've seen before include "Back (in time)" , "Earlier, gone by" , "(Years) before the present time" , "Previously" , "Time past" .)