Buffet at church presents difficulty (5)
I believe the answer is:
hitch
'difficulty' is the definition.
(hitch is a kind of difficulty)
'buffet at church' is the wordplay.
'buffet' becomes 'hit' (buffet can mean to beat or pound).
'at' means one lot of letters go next to another.
'church' becomes 'ch' (abbreviation on maps etc).
'hit'+'ch'='HITCH'
'presents' is the link.
(Other definitions for hitch that I've seen before include "Hindrance" , "Jerk" , "Make fast" , "get a free ride" , "knot" .)