Fuel-carrying ship (5)

I think it could be either:

Which length description are you looking for?:

3,6

oiler

'fuel-carrying ship' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for oiler that I've seen before include "Petroleum tanker" , "One applying lubricant" , "Loire (anag.)" , "it may be 4 [SHIPSHAPE]" , "Grease monkey" .)

I've seen this clue in the LA Times and the USA Today.

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