It may describe the infinitive 'to burst' (5)

I believe the answer is:

split

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'to burst' is the definition.
('split' can be a synonym of 'burst')

I don't understand the rest of the clue.

(Other definitions for split that I've seen before include "Cause fission of (atom)" , "Leave - crack" , "Croatian destination" , "share out" , "Separate, break into parts" .)

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

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