Labour to replenish the dairy farmer's stock (5)

I believe the answer is:

calve

I'm a little stuck... Click here to teach me more about this clue!

'stock' is the definition.
Although both the answer and definition are verbs in their base form, I cannot understand how one could define the other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for calve that I've seen before include "left in grotto" , "create seal" , "Produce a young cow" , "Give birth (of cow, elephant etc)" , "Split from the pack" .)

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

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