Crossword Genius

Altering navy rig at sea (7)

Ross

I believe the answer is:

varying

'altering' is the definition.
('vary' can be a synonym of 'alter')

'navy rig at sea' is the wordplay.
'at sea' indicates anagramming the letters.
'navy'+'rig'='navyrig'
'navyrig' is an anagram of 'VARYING'.

(Other definitions for varying that I've seen before include "Differing, diversifying" , "Differing, changing" .)

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