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Sunhats:
oddly
ignored
means
of
preserving
life
(3)
Sunhats: oddly ignored means of preserving life (3)
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The definition is at the end of the clue.
How the clue works
The definition is means of preserving life, cluing UHT (Ultra High Temperature pasteurisation, which extends shelf life). Take SUNHATS and pull out the even-positioned letters while oddly ignored strips away the odd ones (S, N, A, S), leaving you U, H, T.