Crossword Genius

Formerly transient, now off the cuff (11)

Ross

I believe the answer is:

extemporary

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'now off the cuff' is the definition.
I can't judge whether this defines the answer.

'formerly transient' is the wordplay.
'formerly' becomes 'ex' (prefix meaning former or onetime).
'transient' becomes 'temporary' (similar in meaning).
'ex'+'temporary'='EXTEMPORARY'

Can you help me to learn more?

(Another definition for extemporary that I've seen is " With no preparation or forethought".)

I've seen this clue in The Irish News.
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