This guy Sue, uplifted, thanks before Church (7)
I believe the answer is:
eustace
'this guy' is the definition.
(I've seen this before)
'sue uplifted thanks before church' is the wordplay.
'uplifted' is a reversal indicator.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'before' says to put letters next to each other.
'church' becomes 'CE' (abbreviation for Church of England).
'sue' in reverse letter order is 'eus'.
'eus'+'ta'+'ce'='EUSTACE'
(Other definitions for eustace that I've seen before include "guy" , "Fellow" , "Man's name" , "The - - Diamonds (Trollope)" , "Man" .)