Church gets some jewellery to shrink (6)
I believe the answer is:
cringe
'to shrink' is the definition.
(synonyms)
'church gets some jewellery' is the wordplay.
'church' becomes 'CE' (abbreviation for Church of England).
'gets' is an insertion indicator (gets can mean captures or absorbs).
'some jewellery' becomes 'ring' (ring is a kind of jewellery).
'ce' enclosing 'ring' is 'CRINGE'.
(Other definitions for cringe that I've seen before include "Show submission or fear" , "'Cower, flinch (6)'" , "Cower in fear or disgust" , "quail" , "obeisance" .)