Crossword Genius

Defender in boats at sea (7)

Ross

I believe the answer is:

bastion

'defender' is the definition.
(I've seen this before)

'in boats at sea' is the wordplay.
'at sea' indicates an anagram.
'in'+'boats'='inboats'
'inboats' with letters rearranged gives 'BASTION'.

(Other definitions for bastion that I've seen before include "staunch supporter" , "that's fortified" , "Obtains (anag.)" , "Stronghold, fortification" , "Obtains in fortified place or stronghold" .)

I've seen this clue in The Sun.
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