Somewhere to warm up tramp, nothing less (3)
I believe the answer is:
hob
'somewhere to warm up' is the definition.
(as in a hob on a stove)
I can't explain the remainder of the clue.
(Other definitions for hob that I've seen before include "Cooker ring" , "Hot plate" , "Cooker top" , "Hot-plate" , "hot spot" .)