I mention novel straightaway (2,2,4)

I believe the answer is:

in no time

'straightaway' is the definition.
(thesaurus)

'i mention novel' is the wordplay.
'novel' indicates anagramming the letters (letters in a new or novel order).
'mention' is an anagram of 'nnotime'.
'i'+'nnotime'='IN NO TIME'

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

I've seen this clue in The Globe and Mail.

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