Tramp needs first ring only in cooker top (3)

I believe the answer is:

hob

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'cooker top' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for hob that I've seen before include "Small goblin" , "Top of stove" , "hot spot" , "Hot-plate" , "Top of one of 8 down" .)

I've seen this clue in The Sun.

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