Cold church houses habit support (6)
I believe the answer is:
crutch
'support' is the definition.
(I've seen this before)
'cold church houses habit' is the wordplay.
'cold' becomes 'c' (eg on taps).
'church' becomes 'ch' (common abbreviation).
'houses' means one lot of letters goes inside another.
'habit' becomes 'rut' (as in the phrase 'stuck in a rut').
'c'+'ch'='cch'
'cch' placed around 'rut' is 'CRUTCH'.
(Other definitions for crutch that I've seen before include "Supporting staff" , "Support for a disabled person while walking" , "Support for one with injured leg" , "Staff used as an aid to walking" , "Staff used by lame person" .)