Built sea craft - is that fitting? (8)

I believe the answer is:

suitable

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'fitting?' is the definition.
('suitable' can be a synonym of 'fitting')

'built sea craft is' is the wordplay.
'built sea' anagrams to 'SUITABLE'.
But, I'm unsure how this is indicated.

'that' acts as a link.

Can you help me to learn more?

(Other definitions for suitable that I've seen before include "Appropriate, apt" , "Appropriate, befitting" , "qualified" , "Satisfactory, worthy" , "In character" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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