Crossword Genius

Greek unit guards Yankee breakwater (6)

Ross

I believe the answer is:

groyne

'breakwater' is the definition.
('groyne' can be a synonym of 'breakwater')

'greek unit guards yankee' is the wordplay.
'greek' becomes 'gr'.
'unit' becomes 'one' ('one' can be a synonym of 'unit'**).
'guards' indicates putting letters inside.
'yankee' becomes 'y' (phonetic alphabet: alpha, bravo, charlie etc.).
'one' going around 'y' is 'oyne'.
'gr'+'oyne'='GROYNE'

(Other definitions for groyne that I've seen before include "Structure built to control coastal erosion" , "Sea wall" , "Anti-erosion breakwater" , "A bulwark" , "Beach-protecting wall" .)

I've seen this clue in The Times.
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