Hand-held device showing western, old film featuring boozer (6-6)
I believe the answer is:
walkie-talkie
'hand-held device' is the definition.
(I know that walkie-talkie is a type of hand-held device)
'western old film featuring boozer' is the wordplay.
'western' becomes 'w'.
'old film' becomes 'talkie' (as opposed to a silent film).
'featuring' means one lot of letters goes inside another.
'boozer' becomes 'alkie' (alcoholic).
'w'+'talkie'='wtalkie'
'wtalkie' enclosing 'alkie' is 'WALKIE-TALKIE'.
'showing' acts as a link.
(Other definitions for walkie-talkie that I've seen before include "Portable two-way radio" , "Portable communication device" , "Two way radio" .)