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Enthusiasm
in
the
heart
of
Commonwealth
country
(4)
Enthusiasm in the heart of Commonwealth country (4)
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The definition is at the beginning of the clue.
How the clue works
Right, so Enthusiasm is your definition there, pointing to ZEAL. For the wordplay, "Commonwealth country" is New Zealand, and if you dig into the heart of NEWZEALAND, sitting right in the middle, you find ZEAL hidden away.