Chap finding voyaging at sea hard work (5,5)

I believe the answer is:

heavy going

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'chap finding voyaging at sea hard work' is the definition.
I can't tell whether this definition defines the answer.

'chap finding voyaging at sea' is the wordplay.
'chap' becomes 'he'.
'finding' is a charade indicator (letters next to each other).
'at sea' is an anagram indicator.
'voyaging' anagrammed gives 'avygoing'.
'he'+'avygoing'='HEAVY GOING'

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I've seen this clue in The Guardian.

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