Crossword Genius

One might blow this small bit of money while going round street (5,7)

Ross

I believe the answer is:

penny whistle

'one might blow this' is the definition.
(you blow a penny whistle to play it)

'small bit of money while going round street' is the wordplay.
'small bit of money' becomes 'penny' (coin of little value).
'going round' indicates putting letters inside (some letters go around others).
'street' becomes 'st' (abbreviation).
'while' going around 'st' is 'whistle'.
'penny'+'whistle'='PENNY-WHISTLE'

(Another definition for penny whistle that I've seen is " Flageolet".)

I've seen this clue in The Telegraph.
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