Bolts entrance to storehouse after derisory comment (6)

I believe the answer is:

scoffs

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'bolts' is the definition.
Although both the answer and definition are verbs in their -s form, I don't see how they can define each other.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for scoffs that I've seen before include "Mocks, derides" , "Ridicules or eats slangily" , "Ridicules - or drinks quickly" , "Derides or drinks slangily" , "Mocks - eats" .)

I've seen this clue in The Times.

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