Cameras may check this disturbed deep-sea grave (7,5)

I believe the answer is:

average speed

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'cameras may check' is the definition.
I can't judge whether this definition defines the answer.

'disturbed deep-sea grave' is the wordplay.
'disturbed' indicates an anagram (the order of letters is disturbed).
'deep'+'sea'+'grave'='deepseagrave'
'deepseagrave' anagrammed gives 'AVERAGE SPEED'.

'this' acts as a link.

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I've seen this clue in The Guardian.

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