Share a hole (5)

I believe the answer is:

halve

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

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

I cannot understand how the rest of the clue works.

(Other definitions for halve that I've seen before include "Cut into two equal portions" , "split with another" , "Bisect" , "Share equally" , "Split in two" .)

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

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