15 across
Working
vessel’s
doctor
–
creep,
right?
(7)
Working vessel’s doctor – creep, right? (7)
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The definition is at the beginning of the clue.
How the clue works
The definition is Working vessel — a dredger being a boat that works by dredging. Then the wordplay builds it up piece by piece: doctor gives you DR, creep gives you EDGE (as in to edge along), and right tacks on R at the end.