Flick cheese and soggy ground matter on back (5,9)
I believe the answer is:
brief encounter
'flick' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'cheese and soggy ground matter on back' is the wordplay.
'cheese' becomes 'brie' (Brie is an example).
'and' is a charade indicator (letters next to each other).
'soggy ground' becomes 'fen' (I've seen this in another clue).
'matter on back' becomes 'counter' (I am not sure about this - if you are sure you should believe this answer much more).
'brie'+'fen'+'counter'='BRIEF ENCOUNTER'
Can you help me to learn more?
(Other definitions for brief encounter that I've seen before include "Film set largely at a railway station" , "Picture" .)