A passion for keeping warm? (4)
I believe the answer is:
fire
'warm?' is the definition.
(thesaurus)
'a passion for keeping' is the wordplay.
'a passion' becomes 'ire' (ire is passionate anger).
'for' means one lot of letters go next to another (I've seen this in other clues).
'keeping' becomes 'f' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ire' put after 'f' is 'FIRE'.
Can you help me to learn more?
(Other definitions for fire that I've seen before include "Sack; discharge (a gun)" , "Manually operated device for dealing with flames" , "... or combustion" , "There's no smoke without it" , "Ready, aim . . . ." .)