Musical instrument from Thailand received by Al Gore (7)
I believe the answer is:
althorn
'musical instrument' is the definition.
(I've seen this before)
'thailand received by al gore' is the wordplay.
'thailand' becomes 't' (abbreviation on car registration plates).
'received by' indicates putting letters inside.
'gore' becomes 'horn' (synonyms).
'al'+'horn'='alhorn'
't' inserted within 'alhorn' is 'ALTHORN'.
'from' is the link.
(Other definitions for althorn that I've seen before include "one of the brass" , "musical instrument" .)