An erotic sort of response (8)
I believe the answer is:
reaction
'response' is the definition.
('reaction' can be a synonym of 'response')
'an erotic sort' is the wordplay.
'sort' indicates anagramming the letters.
'an'+'erotic'='anerotic'
'anerotic' anagrammed gives 'REACTION'.
'of' acts as a link.
(Other definitions for reaction that I've seen before include "Side-effect from drug" , "Feedback" , "Response to stimulus from creation" , "In mechanics, every action has an equal and opposite one" , "Into care (anag)" .)