Trap moggy next to church (5)
I believe the answer is:
catch
'trap' is the definition.
(thesaurus)
'moggy next to church' is the wordplay.
'moggy' becomes 'cat' (I've seen this before).
'next to' says to put letters next to each other.
'church' becomes 'ch' (common abbreviation).
'cat'+'ch'='CATCH'
(Other definitions for catch that I've seen before include "Concealed difficulty" , "problem in small print?" , "Seize hold of" , "Fly in the ointment" , "Trap - hear - contract" .)