Say yes, the time has come round again for it (5)
I believe the answer is:
agree
'say yes' is the definition.
'agree' can be an answer for 'yes' (thesaurus). I am not certain of the 'say' bit.
'the time has come round again for it' is the wordplay.
'the time has' becomes 'ga' (I can't justify this - if you can you should believe this answer much more).
'come round' shows that the letters should be reversed in order (I've seen 'coming round' mean this).
'again' becomes 're'.
'for' says to put letters next to each other.
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'ga' in reverse letter order is 'ag'.
'ag'+'re'+'e'='AGREE'
Can you help me to learn more?
(Other definitions for agree that I've seen before include "Consent required" , "Concur - correspond" , "'Birds in their little nest . . . . .'" , "Enjoy view in common" , "Concur, coincide" .)