Talk of Romeo appearing in a sort of toga! (5)

I believe the answer is:
argot
'talk' is the definition.
(I have seen 'Talk of thieves' mean 'argot' so perhaps 'talk' could also mean 'argot')
'romeo appearing in a sort of toga' is the wordplay.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'appearing in' means one lot of letters goes inside another.
'a sort of' indicates an anagram.
'toga' with letters rearranged gives 'agot'.
'r' put within 'agot' is 'ARGOT'.
'of' is the link.
(Other definitions for argot that I've seen before include "Slang for a groat (5)" , "Cant" , "Ancient Greek coin" , "Special jargon of a group" , "Jargon or slang (of a group)" .)