Blessing: deities close (7)
I believe the answer is:
godsend
'blessing' is the definition.
(I've seen this in another clue)
'deities close' is the wordplay.
'deities' becomes 'gods' ('god' can be a synonym of 'deity').
'close' becomes 'end' (I've seen this in other clues).
'gods'+'end'='GODSEND'
(Other definitions for godsend that I've seen before include "Something unexpected but welcome" , "Unexpected help" , "welcome acquisition" , "'Manna from heaven'" , "Dog's den (anag.)" .)