Nervous, I change holiday purchase (8)
I believe the answer is:
souvenir
'holiday purchase' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'nervous i change' is the wordplay.
'change' indicates anagramming the letters.
'nervous'+'i'='nervousi'
'nervousi' anagrammed gives 'SOUVENIR'.
Can you help me to learn more?
(Other definitions for souvenir that I've seen before include "Reminder of holiday" , "Reminder of past events" , "Keepsake, memento" , "remember seeing this?" , "something worth keeping" .)