Crossword Genius

Spontaneous (9)

Ross

There are a few possibilities for this:

'spontaneous' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for impromptu that I've seen before include "Unplanned; composition" , "Without rehearsal or preparation" , "Unprepared" , "Extemporaneous speech" , "On the spur of the moment" .)

I've seen this clue in The Sunday Times.
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