God is English? That's boost! (5)
I believe the answer is:
raise
'boost' is the definition.
(I know that boost is a kind of raise)
'god is english?' is the wordplay.
'god' becomes 'Ra' (Egyptian god).
'english?' becomes 'e' (abbreviation).
'ra'+'is'+'e'='RAISE'
'that's' is the link.
(Other definitions for raise that I've seen before include "Make greater" , "Contact" , "Put up" , "Aries (anag)" , "Increase; elevate" .)