Bound to be a pleasant time of the year (6)

I believe the answer is:

spring

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'bound' is the definition.
(both can mean to leap)

I don't understand the remainder of the clue.

(Other definitions for spring that I've seen before include "early in the year" , "Well - bound" , "Bound; source" , "May is part of this" , "Leap - part of year" .)

I've seen this clue in the Sydney Morning Herald.

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