Just a little heat for the empty room (5)
I believe the answer is:
therm
'just a little heat' is the definition.
I can't tell whether this defines the answer.
'the empty room' is the wordplay.
'empty' says to hollow out the word (remove centre letters).
'room' with its centre removed is 'rm'.
'the'+'rm'='THERM'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for therm that I've seen before include "A hot unit" , "Amount of heat" , "Unit of heat energy" , "Indicator of heat" , "it measures heat" .)