River hot, shade burnt? (6)
I believe the answer is:
humber
'river' is the definition.
(English river)
'hot shade burnt?' is the wordplay.
'hot' becomes 'h' (abbreviation eg on taps).
'shade burnt?' becomes 'umber' (burnt umber is a colour).
'h'+'umber'='HUMBER'
(Other definitions for humber that I've seen before include "River at Grimsby" , "Estuary of NE England" , "Yorkshire river" , "One bending light rays" , "Northeast river estuary" .)