Note found in old copper device attached to bottle (5)
I believe the answer is:
optic
'device attached to bottle' is the definition.
(device for measuring spirits)
'note found in old copper' is the wordplay.
'note' becomes 'ti' (musical note as in do re mi fa so la ti).
'found in' indicates putting letters inside.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'copper' becomes 'PC' (police constable).
'o'+'pc'='opc'
'ti' put into 'opc' is 'OPTIC'.
(Other definitions for optic that I've seen before include "Device for dispensing measures of spirits" , "Teacher's maybe dispensed with this" , "Relating to vision" , "Of the eye - drinks dispenser" , "Bar measure" .)