Caught parson with diamonds in Split (7)
I believe the answer is:
crevice
'split' is the definition.
(I've seen this before)
'caught parson with diamonds' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'parson' becomes 'rev' (I've seen this in other clues).
'with' is a charade indicator (letters next to each other).
'diamonds' becomes 'ice' (slang term for diamonds).
'c'+'rev'+'ice'='CREVICE'
'in' acts as a link.
(Other definitions for crevice that I've seen before include "Narrow rock fissure" , "Crack or fissure." , "Opening" , "Cleft, fissure" , "Split" .)