Scotsman caught wearing tech firm's device (9)
I believe the answer is:
appliance
'device' is the definition.
(I've seen this before)
'scotsman caught wearing tech firm's' is the wordplay.
'scotsman' becomes 'ian'.
'caught' becomes 'c' (cricket abbreviation).
'wearing' means one lot of letters goes inside another.
'tech firm' becomes 'apple'.
'ian'+'c'='ianc'
'ianc' inserted inside 'apple' is 'APPLIANCE'.
(Other definitions for appliance that I've seen before include "Domestic machine" , "Machine, piece of equipment" , "food mixer, perhaps" , "Device used for a particular purpose" , "Washing machine or toaster, say" .)