He has a growing interest in his job (8)

I believe the answer is:

gardener

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'he' is the definition.

I cannot understand how the remainder of the clue works.

(Other definitions for gardener that I've seen before include "Horticulturist" , "Cultivator" , "Nursery employee" , "Red anger of an outdoor worker" , "one working on plot?" .)

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

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