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Crusty
growth
in
part
of
metallic
henneries
(6)
Crusty growth in part of metallic henneries (6)
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The definition is at the beginning of the clue.
How the clue works
See "Crusty growth" — that's your definition, pointing to lichen, the crusty stuff you find growing on rocks and trees. Now look at "part of metallic henneries" — that's your instruction to go hunting inside the phrase, and sure enough LICHEN is sitting there hidden across the join, metal-LIC HEN-neries.