Give a benediction (5)
I believe the answer is:
bless
'give a benediction' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bless that I've seen before include "Praise - consecrate" , "Make holy" , "Isn't that sweet?" , "Consecrate; be thankful for" , "Give honour to" .)