Doreen's dicky back (7)

I believe the answer is:

endorse

'back' is the definition.
('endorse' can be a synonym of 'back')

'doreen's dicky' is the wordplay.
'dicky' is an anagram indicator (dicky can mean ill or non-functioning).
'doreens' is an anagram of 'ENDORSE'.

(Other definitions for endorse that I've seen before include "Support (with signature)" , "Affirm" , "Champion" , "Red ones (anag.)" , "Give one's sanction to" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.