Upset us, tearing autograph (9)
I believe the answer is:
signature
'autograph' is the definition.
(I've seen this before)
'upset us tearing' is the wordplay.
'upset' is an anagram indicator.
'us'+'tearing'='ustearing'
'ustearing' with letters rearranged gives 'SIGNATURE'.
(Other definitions for signature that I've seen before include "(In music) the sharps or flats that follow the clef and indicate the key" , "Identifying script" , "Handwritten name" , "distinctive style" , "Distinctive mark" .)