Cleric, one about to divide church, creating split (7)
I believe the answer is:
crevice
'split' is the definition.
(I've seen this before)
'cleric one about to divide church' is the wordplay.
'cleric' becomes 'rev' (abbreviation for Reverend).
'one about' becomes 'ic' (I've seen this in other clues**).
'to divide' indicates putting letters inside.
'church' becomes 'ce' (abbreviation for Church of England).
'rev'+'ic'='revic'
'revic' put within 'ce' is 'CREVICE'.
'creating' is the link.
(Other definitions for crevice that I've seen before include "Narrow crack" , "Opening" , "Crack or fissure." , "Cleft, fissure" , "Narrow rock fissure" .)