Crossword Genius

Small amount of cash turned up (100 pounds) outside diner (9)

Ross

I believe the answer is:

picnicker

'outside diner' is the definition.
(someone dining outside)

'small amount of cash turned up 100 pounds' is the wordplay.
'small amount of cash' becomes 'IP' (resembles 1p, one penny).
'turned up' shows that the letters should be reversed in order.
'100' becomes 'c' (Roman numeral).
'pounds' becomes 'nicker' (nicker can informally mean pounds sterling).
'ip' back-to-front is 'pi'.
'pi'+'c'+'nicker'='PICNICKER'

I've seen this clue in The Guardian.
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