Crossword Genius

Some ____s are the largest mobile man-made structures (3,6)

Ross

I believe the answer is:

oil tanker

(Other definitions for oil tanker that I've seen before include "craft" , "Fuel transport ship" , "[See] ocean-going vessel" , "Fuel transporter" , "boat" .)

I've seen this clue in The Times and The Sunday Times.
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