When no blessing held honour (7)
I believe the answer is:
ennoble
'honour' is the definition.
(ennobling is a kind of honouring)
'when no blessing held' is the wordplay.
'held' indicates the answer is hidden within the clue.
'ENNOBLE' is hidden in the letters of 'when no blessing'.
(Other definitions for ennoble that I've seen before include "Raise status" , "Raise to the aristocracy" , "Noel Ben (anag)" , "Make a peer" , "Elevate to the aristocracy" .)