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What a great time Deb and Rob and Seb all have! (5)

Ross

I believe the answer is:

blast

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'what a great time' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

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(Other definitions for blast that I've seen before include "Report" , "slate" , "Great time: explosion" , "Shoot" , "Severely criticise" .)

I've seen this clue in The Times.
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