Definitely where Sir should go to be loved! (6)
I believe the answer is:
indeed
'definitely' is the definition.
(thesaurus)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for indeed that I've seen before include "In reality" , "Certainly, quite so" , "Really - truly" , "Actually -- denied (anag)" , "still" .)