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Inject
vitamins
into
skin
that’s
loose
(6)
Inject vitamins into skin that’s loose (6)
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The definition is at the end of the clue.
How the clue works
Look at loose — that's your definition, in the sense of slack or flabby. For the wordplay, skin gives you FLAY, and you inject BB (a pair of B vitamins) into it to get FLA-BB-Y.