Field men to support cult (6)
I believe the answer is:
sector
'field' is the definition.
(sector can mean an area or field)
'men to support cult' is the wordplay.
'men' becomes 'OR' (Other Ranks: non-commissioned soldiers).
'to support' is a charade indicator (letters next to each other) (in a down clue, some letters hold up others).
'cult' becomes 'sect' (religious sect).
'or' put after 'sect' is 'SECTOR'.
(Other definitions for sector that I've seen before include "Area, division" , "Area covered by corset" , "Division or part" , "Escort in zone" , "Subdivision of area" .)