Crossword Genius

A Parisian engaged in flimsy, crazy thinking (6)

Ross

I believe the answer is:

lunacy

'crazy thinking' is the definition.
(being a lunatic)

'a parisian engaged in flimsy' is the wordplay.
'a parisian' becomes 'un' ('a' in French).
'engaged in' means one lot of letters goes inside another.
'flimsy' becomes 'lacy' (lace is a flimsy material).
'un' inserted inside 'lacy' is 'LUNACY'.

(Other definitions for lunacy that I've seen before include "Moon madness" , "Madness, insanity" , "Extreme folly, insanity" , "Tomfoolery" , "State of madness" .)

I've seen this clue in The Times.
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