How a bird eats corn; lots of it (5)

I believe the answer is:

pecks

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'lots of it' is the definition.
Although both the answer and definition are verbs in their -s form, I cannot understand how one could define the other.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for pecks that I've seen before include "stumbles" , "Plants a kiss" , "Strikes or nips with beak" , "Kisses" .)

I've seen this clue in The Globe and Mail.

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