Crossword Genius

Strike a bit of an idiot as fast (5)


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'fast' is the definition.
(similar in meaning)

'strike a bit of an idiot' is the wordplay.
'strike' becomes 'rap' (synonyms).
'a bit of an idiot' becomes 'id' (I can't explain this - if you can you should give a lot more credence to this answer).

'as' acts as a link.

Can you help me to learn more?

(Other definitions for rapid that I've seen before include "Happening quickly" , "Speedy (5)" , "Quickly accomplished" , "Fast, speedy" , "Brisk" .)

I've seen this clue in the Evening Standard.
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