In a riot, await flyer, spend wastefully (6,4)

I believe the answer is:

trifle away

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'spend wastefully' is the definition.
'trifle away' can be an answer for 'spend' (trifling away is a kind of spending). I am unsure of the 'wastefully' bit.

'in a riot await flyer' is the wordplay.
'in a riot' indicates anagramming the letters.
'await'+'flyer'='awaitflyer'
'awaitflyer' with letters rearranged gives 'TRIFLE AWAY'.

Can you help me to learn more?

I've seen this clue in The Hindu.

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