Crossword Genius

Boat; wrench (3)

Ross

I believe the answer is:

tug

I believe this clue is a double definition.

'boat' is the first definition.
(tug is a kind of boat)

'wrench' is the second definition.
(I've seen this in another clue)

(Other definitions for tug that I've seen before include "Small ship for pulling" , "Pull like small boat" , "Boat to pull larger ones" , "A sharp pull or a towing boat" , "Small boat for towing others" .)

I've seen this clue in The Telegraph.
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