Warmer consumer cut in front (3-6)
I believe the answer is:
gas-heater
'warmer' is the definition.
(gas heater is a kind of warmer)
'consumer cut in front' is the wordplay.
'consumer' becomes 'eater' (consume can mean to eat).
'cut' becomes 'gash' (a gash is a wound or cut).
'in front' is a charade indicator (letters next to each other).
'eater' after 'gash' is 'GAS-HEATER'.
(Other definitions for gas-heater that I've seen before include "Domestic warming appliance" , "Get a share (anag.)" .)