Crossword Genius

After sudden sharp blow, check loose parts of cable at sea (6)

Ross

I believe the answer is:

slatch

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'after sudden sharp blow' is the first definition.
The definition suggests a singular noun which matches the answer.

'check loose parts of cable at sea' is the second definition.
I can't judge whether this definition defines the answer.

Can you help me to learn more?

I've seen this clue in The Times and The Sunday Times.
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