Backing
(Other definitions for support that I've seen before include "Champion" , "Help; bear" , "Give assistance to" , "Bear the weight of (something)" , "second" .)
(Other definitions for endorsement that I've seen before include "Official backing" , "Support and approval" , "Approval - modern teens (anag)" , "Green light" , "drivers would prefer not to have?" .)
'backing' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pro that I've seen before include "Of argument, say, in favour of" , "One doesn't play just for the love of it, in short" , "In brief, he's no amateur" , "gets paid to play?" , "Top player" .)
'backing' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for for that I've seen before include "and 16 and 20: Notwithstanding" , "See 24" , "Favouring" , "In favour of; since" , "Approving" .)
'backing' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aid that I've seen before include "A hand" , "Care and help" , "technique that can produce pregnancy" , "assistant" , "Good point" .)