Diane and Jonathon cut the mustard (5)
I believe the answer is:
dijon
'mustard' is the definition.
Both the definition and answer are singular nouns.
Maybe there's a link between them I don't understand?
'diane and jonathon cut' is the wordplay.
'diane' becomes 'di' (short for Diane).
'and' becomes 'n' (common abbreviation for 'and').
'jonathon' becomes 'jo' (I can't justify this - if you can you should give a lot more credence to this answer).
'cut' means one lot of letters goes inside another (some letters have cut into others).
'di'+'n'='din'
'din' going around 'jo' is 'DIJON'.
'the' is the link.
Can you help me to learn more?
(Other definitions for dijon that I've seen before include "City of eastern France, known for mustard" , "Source of mustard" , "French city renowned for mustard" , "French home of mustard?" , "French city well-known for mustard" .)