Gosh - a weird signal comes from musical instrument! (3,7)
I believe the answer is:
cor anglais
'musical instrument' is the definition.
(cor anglais is a kind of musical instrument)
'gosh a weird signal' is the wordplay.
'gosh' becomes 'cor' (I've seen this before).
'weird' is an anagram indicator.
'signal' is an anagram of 'nglais'.
'cor'+'a'+'nglais'='COR ANGLAIS'
'comes from' is the link.
(Other definitions for cor anglais that I've seen before include "horn?" , "MUSICAL INSTRUMENT" , "Woodwind instrument" , "Orchestra member rarely" , "belonging to a broken-down 27 [CARTHORSE]" .)