Leave area for Indian state (3)
I believe the answer is:
goa
'for indian state' is the definition.
(Goa is a state of India)
'leave area' is the wordplay.
'leave' becomes 'go' (to go is to depart or leave).
'area' becomes 'a' (maths abbreviation).
'go'+'a'='GOA'
(Other definitions for goa that I've seen before include "Region of India" , "Indian state, former Portuguese colony" , "Indian district" , "Suitable place in India" , "West coast Indian state" .)