Company girl's long back? (6)
I believe the answer is:
disney
'company' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see an association between them that I don't see?
'girl's long back?' is the wordplay.
'girl's' becomes 'Di's' (Di is short for Diana).
'long' becomes 'yen' (synonyms).
'back?' says the letters should be written in reverse (I've seen 'backed' mean this).
'yen' backwards is 'ney'.
'dis'+'ney'='DISNEY'
Can you help me to learn more?
(Other definitions for disney that I've seen before include "Walt, pioneer of cartoon films" , "Walt the film-maker" , "US animated film maker, d. 1966" , "Wealthy (informal)" , "Walt - - , animator" .)