Crossword Genius

Oh, blow it! (5)

Ross

I believe the answer is:

blast

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

I don't understand the rest of the clue.

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(Other definitions for blast that I've seen before include "slate" , "Blow up or swear" , "Sudden, strong current of air" , "Shoot" , "Effect of explosion" .)

I've seen this clue in the Evening Standard.
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