Like engagements at sea (5)
I believe the answer is:
naval
'like engagements at sea' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for naval that I've seen before include "Relating to marine force" , "Of the RN" , "Relating to the Senior Service" , "Relating to nautical defence forces" , "To do with the marine branch of an army" .)