Green’s Dictionary of Slang

1. picking up a variety of odd jobs in the streets, holding horses, carrying parcels etc.

1860		Hotten Dict. of Modern Sl. etc. (2nd edn).
1864, 1867, 1870		Hotten Sl. Dict.

2. buying cheap and selling dear.

1911

G. Stratton-Porter Harvester 113: Well, forever more! And don’t call that fiddlin’ business for a big, healthy, young man.

3. (UK tramp) selling matches.

1935

M. Harrison Spring in Tartarus 300: The selling of matches, curiously enough, is called ‘fiddling’.