Crossword Genius

Means to walk steadily on ship (3,4)

Ross

I believe the answer is:

sea legs

(Other definitions for sea legs that I've seen before include "Ability in the water" , "Ability to cope with life on board" , "What a good sailor has" , "Stability on board ship" , "resistance to sickness" .)

I've seen this clue in The Sun.
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