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Alas, report 550 cracks (5)

Ross

I believe the answer is:

sadly

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'alas' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

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(Other definitions for sadly that I've seen before include "Unhappily" , "Lamentably, unfortunately" , "Regrettably" , "Mournfully" , "I regret to say" .)

I've seen this clue in The Times.
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