"Yes, right, you're the boss!" (3)
I believe the answer is:
sir
'boss' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'yes right you're' is the wordplay.
'right' says to take the final letters (the letter on the right of the word).
'you're' becomes 'ir' (I can't justify this - if you can you should believe this answer much more).
The last letter of 'yes' is 's'.
's'+'ir'='SIR'
'the' acts as a link.
Can you help me to learn more?
(Other definitions for sir that I've seen before include "Title of 1 across" , "Title of knight or baronet" , "Honourable title" , "Male form of address" , "Polite form of address to a man" .)