28 across
It
makes
sense
to
link
supplement
to
drink
…
(4,2)
It makes sense to link supplement to drink … (4,2)
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The definition is at the beginning of the clue.
How the clue works
It makes sense is your definition, since ADDS UP means something is logical or coherent. Take supplement giving you ADD, then drink giving you SUP (as in to sip), and you just stick them together.