Coat, new one, for very hot place (7)
I believe the answer is:
furnace
'very hot place' is the definition.
(I've seen this before)
'coat new one' is the wordplay.
'coat' becomes 'fur' (fur is a kind of coat).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'one' becomes 'ace' (ace has a value of one in some card games).
'fur'+'n'+'ace'='FURNACE'
'for' is the link.
(Other definitions for furnace that I've seen before include "Fiery chamber" , "Enclosed chamber to produce heat" , "Forge" , "Structure for intense heating by fire" , "Chamber for heating minerals or metals" .)