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Winging it in promo, politician to throw away £1,000 (2-7)

Ross

I believe the answer is:

ad-libbing

I'm a little stuck... Click here to teach me more about this clue!

'winging' is the definition.
Although both the answer and definition are present participle verbs, I don't understand how one could define the other.

'it in promo politician to throw away ps1000' is the wordplay.
I cannot quite understand how this works, but
'in' is found in the answer.
'politician' could be 'lib' and 'lib' is located in the answer.
'away' could be 'a' (abbreviation as used in sports fixtures) and 'a' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for ad-libbing that I've seen before include "Speaking without preparation" , "Improvising" .)

I've seen this clue in The Guardian.
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