End up so excited with my book-cover? (9)

I believe the answer is:

pseudonym

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'book-cover?' is the definition.
I can't tell whether this definition defines the answer.

'end up so excited with my' is the wordplay.
'excited with' is an anagram indicator.
'end'+'up'+'so'='endupso'
'endupso' mixed up with 'my' can make 'PSEUDONYM'.

Can you help me to learn more?

(Other definitions for pseudonym that I've seen before include "Lewis Carroll, for one" , "in the style of George Eliot?" , "name, adopted for writing purposes" , "Adopted fictitious name" , "Fictitious identity" .)

I've seen this clue in the Sydney Morning Herald.

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