If you want bread, stick to this (6)
I believe the answer is:
french
'if you want bread stick to this' is the definition.
The definition suggests a singular noun which matches the answer.
This is all the clue.
Can you help me to learn more?
(Other definitions for french that I've seen before include "A Canadian language" , "eg Marie Antoinette" , "Significant language of Belgium, Switzerland and Canada" , "Continental language (Polish?)" , "-- Polish; -- stick" .)