Does it keep the goblins nice and warm? (3)

I believe the answer is:

hob

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'warm?' is the definition.
Although both the answer and definition are verbs in their base form, I can't see how one could define the other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for hob that I've seen before include "Small goblin" , "Cooker ring" , "Cooker top" , "Cooking appliance" , "Top of stove" .)

I've seen this clue in the Evening Standard.

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