OK for head to leave part of India (3)
I believe the answer is:
goa
'part of india' is the definition.
(Goa is in India)
'ok for head to leave' is the wordplay.
'ok for head' becomes 'a' (I can't explain this - if you can you should believe this answer much more).
'to' says to put letters next to each other (I've seen this in other clues).
'leave' becomes 'go' (to go is to depart or leave).
'a' after 'go' is 'GOA'.
Can you help me to learn more?
(Other definitions for goa that I've seen before include "holiday destination in Asia" , "Former Portuguese colony on the west coast of India" , "Former Portuguese territory in India" , "State on west coast of India" , "part of subcontinent" .)