Crossword Genius

Banger lacking taste, but not cold (4)

Ross

I believe the answer is:

heap

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'banger' is the definition.
(heap is a kind of automobile)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for heap that I've seen before include "Pile, stack" , "pile-up" , "Mound; old car" , "Mound, stack" , "car on its last legs" .)

I've seen this clue in The Times.
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