Scotsman about to fill fruit machine (9)
I believe the answer is:
appliance
'machine' is the definition.
(I've seen this before)
'scotsman about to fill fruit' is the wordplay.
'scotsman' becomes 'ian' (common Scottish name).
'about' becomes 'c' (circa).
'to fill' means one lot of letters goes inside another.
'fruit' becomes 'apple' (apple is a kind of fruit).
'ian'+'c'='ianc'
'ianc' going into 'apple' is 'APPLIANCE'.
(Other definitions for appliance that I've seen before include "Useful device, gadget" , "Device performing specific task" , "implement" , "food mixer, perhaps" , "Instrument for a particular purpose" .)