Support place in south-east for church tower (7)
I believe the answer is:
steeple
'for church tower' is the definition.
(I've seen this in another clue)
'support place in south-east' is the wordplay.
'support' becomes 'tee' (tee is a kind of support).
'place' becomes 'pl' (abbreviation used in postal addresses).
'in' indicates putting letters inside.
'south east' becomes 'SE' (abbreviation).
'tee'+'pl'='teepl'
'teepl' going into 'se' is 'STEEPLE'.
(Other definitions for steeple that I've seen before include "Pet eels (anag)" , "Pointed structure" , "that the church may be under" , "Tall building" , "point" .)