Performers argue vaguely about limitations to roles? It’s sweet (6,5)
I believe the answer is:
caster sugar
'roles? it's sweet' is the definition.
I can't judge whether this defines the answer.
'performers argue vaguely about limitations' is the wordplay.
'performers' becomes 'cast' (I've seen this before).
'vaguely' is an anagram indicator.
'about' means one lot of letters goes inside another.
'limitations' becomes 'rs' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'argue' anagrammed gives 'eugar'.
'eugar' placed around 'rs' is 'ersugar'.
'cast'+'ersugar'='CASTER SUGAR'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for caster sugar that I've seen before include "that's taken in dredger" , "Sweet stuff" .)