Crossword Genius

A tower of strength (3)

Ross

I believe the answer is:

tug

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'a tower' is the definition.
(something that tows)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for tug that I've seen before include "Pull hard or suddenly" , "Pull at the towing vessel" , "Towboat" , "Pull a form of boat" , "Working boat" .)

I've seen this clue in The Globe and Mail and The Guardian.
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