Unorthodox believer at this place twitching (7)
I believe the answer is:
heretic
'unorthodox believer' is the definition.
(I've seen this before)
'at this place twitching' is the wordplay.
'at' means one lot of letters go next to another.
'this place' becomes 'here' (I've seen this in other clues**).
'twitching' becomes 'tic' (tic is a kind of twitching).
'here'+'tic' is 'HERETIC'.
(Other definitions for heretic that I've seen before include "I wrongly believe" , "One breaking with orthodox beliefs" , "contrarian" , "enough for victim of Inquisition?" , "Person in conflict with Roman Catholic dogma" .)