Cockney's radiator, perhaps not a cooker? (5)

I believe the answer is:

eater

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'cockney's radiator perhaps' is the definition.
('heater' - radiator is a kind of heater - said with the 'H' dropped - a cockney accent.)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for eater that I've seen before include "type of fruit" , "One consuming" , "diner" , "Person taking course" , "Taker of food" .)

I've seen this clue in The Independent.

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