Passionate twitch behind rambling manor (8)
I believe the answer is:
romantic
'passionate' is the definition.
(I've seen this in another clue)
'twitch behind rambling manor' is the wordplay.
'twitch' becomes 'tic' (tic is a kind of twitch).
'behind' says to put letters next to each other.
'rambling' indicates anagramming the letters.
'manor' anagrammed gives 'roman'.
'tic' after 'roman' is 'ROMANTIC'.
(Other definitions for romantic that I've seen before include "as Darnay perhaps" , "Sentimental" , "Amatory" , "Coin mart (anag.)" , "Such a novel deals with love" .)