Leads, actors, understudies behind theatre in Dundee (6)
I believe the answer is:
gateau
'dundee' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?
'leads actors understudies behind theatre' is the wordplay.
'leads' says to take the initial letters (I've seen 'leading' mean this).
'behind' means one lot of letters go next to another.
'theatre' becomes 'gate' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The initial letters of 'actors understudies' is 'au'.
'au' put after 'gate' is 'GATEAU'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for gateau that I've seen before include "(French?) cake" , "Fancy cake" , "It's sweet" , "Something French for 22?" , "Gooey cake" .)