Crossword Genius

I mention Dicky instantly (2,2,4)

Ross

I believe the answer is:

in no time

'instantly' is the definition.
(thesaurus)

'i mention dicky' is the wordplay.
'dicky' indicates an anagram (dicky can mean ill or non-functioning).
'mention' is an anagram of 'nnotime'.
'i'+'nnotime'='IN NO TIME'

(Other definitions for in no time that I've seen before include "Very rapidly, hardly measurable" , "Very rapidly - but sounds impossible?" , "Without delay, too quick to measure" , "Swiftly" , "Immediately" .)

I've seen this clue in The Sun.
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