Greeting to a "matey" (4)
I believe the answer is:
ahoy
'greeting to a matey' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ahoy that I've seen before include "Temporarily blind" , "Sailor's shout to ship" , "The sailor cries ''ship . . . .''" , "(Nautical) hailing call" , "Hailing term at sea" .)