This may attract fish -- crumbled a bit at sea (10)

I believe the answer is:

groundbait

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'this may attract fish' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'crumbled a bit at sea' is the wordplay.
'crumbled' becomes 'ground' (I've seen this before).
'at sea' indicates anagramming the letters.
'a'+'bit'='abit'
'abit' is an anagram of 'bait'.
'ground'+'bait'='GROUNDBAIT'

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(Another definition for groundbait that I've seen is " hooker's hoping this'll be tempting".)

I've seen this clue in The Telegraph.

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