25 across
Enthusiasm
at
heart
of
Maoris’
home
(4)
Enthusiasm at heart of Maoris’ home (4)
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The definition is at the beginning of the clue.
How the clue works
Enthusiasm is the definition, pointing to ZEAL. For the wordplay, Maoris' home gives you New Zealand, and ZEAL is hiding right at the heart of New ZEALand — pluck it out from the middle of the word and there's your answer.