Church supporting managed farm (5)
I believe the answer is:
ranch
'farm' is the definition.
(ranch is a kind of farm)
'church supporting managed' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'supporting' says to put letters next to each other (in a down clue, some letters go below others).
'managed' becomes 'ran' (I've seen this before**).
'ch' after 'ran' is 'RANCH'.
(Other definitions for ranch that I've seen before include "Large American farm" , "Farm on a large scale" , "Large farm rearing particular livestock" , "American house?" , "Agricultural complex" .)