Feel very hot water up north? (4)
I believe the answer is:
burn
'feel' is the definition.
(I know this)
'very hot water up north?' is the wordplay.
'very hot water' becomes 'rub' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'north?' becomes 'N' (abbreviation).
'rub' written backwards gives 'bur'.
'bur'+'n'='BURN'
Can you help me to learn more?
(Other definitions for burn that I've seen before include "Use as fuel" , "pain during exercise" , "running water" , "Use heat < in attempt to eliminate" , "Smart" .)