Nervous about holding international trophy (8)
I believe the answer is:
souvenir
'trophy' is the definition.
(thesaurus)
'nervous about holding international' is the wordplay.
'about' indicates anagramming the letters.
'holding' is an insertion indicator.
'international' becomes 'i' (abbreviation eg in IMF).
'nervous' is an anagram of 'souvenr'.
'souvenr' enclosing 'i' is 'SOUVENIR'.
(Other definitions for souvenir that I've seen before include "remember seeing this?" , "Reminder of past events" , "something worth keeping" , "Reminder of holiday" , "Keepsake, memento" .)