Article in seagoing vessel having one dimension (6)

I believe the answer is:

linear

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'having one dimension' is the definition.
I can't judge whether this defines the answer.

'article in seagoing vessel' is the wordplay.
'article' becomes 'a' (the indefinite article in English).
'in' indicates putting letters inside.
'seagoing vessel' becomes 'liner'.
'a' placed inside 'liner' is 'LINEAR'.

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(Other definitions for linear that I've seen before include "Straight; sequential" , "One-dimensional" , "Arranged in straight fashion" , "Long and narrow, of one dimension" , "Nailer (anag.)" .)

I've seen this clue in The Times.

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