James will need a big hole for this shrub

I believe the answer is:

jasmine

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'for this shrub' is the definition.
(jasmine is a kind of shrub)

I cannot understand how the rest of the clue works.

(Other definitions for jasmine that I've seen before include "Plant" , "Shrub with fragrant yellow or white flowers" , "Fragrant shrub used to flavour tea" , "Fragrant flower" , "Sweet-smelling shrub" .)

I've seen this clue in The Irish Independent.

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