Crossword Genius

Perform like Eminem, casually fast (7)

Ross

I believe the answer is:

rapidly

'fast' is the definition.
(synonyms)

'perform like eminem casually' is the wordplay.
'perform like eminem' becomes 'rap' (Eminem is a rapper).
'casually' becomes 'idly' (I've seen this in another clue).
'rap'+'idly'='RAPIDLY'

(Other definitions for rapidly that I've seen before include "Fast" , "With great speed" , "Speedily" , "At a great rate" , "right off the bat" .)

I've seen this clue in The Telegraph.
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