Move right in for confession (6)
I believe the answer is:
shrift
'for confession' is the definition.
(shrift is a kind of confession)
'move right' is the wordplay.
I cannot quite see how this works, but
'right' could be 'r' (common abbreviation) and 'r' is found within the answer.
'move' could be 'shift' (shift is a kind of move) and 'shift' is found within the leftover letters.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for shrift that I've seen before include "Short . . . . . . is curt treatment" , "Given a short one, one is dismissed" , "form of confession" , "Absolution and penance (now usually short!)" , "'Short ------', given scant attention" .)