He nominally sets course at sea (4)

I believe the answer is:

sean

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'he nominally sets' is the definition.
The definition suggests a singular noun which matches the answer.

'course at sea' is the wordplay.
'course' becomes 'n' ().
'at' means one lot of letters go next to another (I've seen this in other clues).
'n' put after 'sea' is 'SEAN'.

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(Other definitions for sean that I've seen before include "Irish form of John" , "Penn, Bean or O'Casey" , "- - Connery (007)" , "guy at Number 10 [IRISHMAN]" .)

I've seen this clue in the Evening Standard.

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