Party finishing early had perplexed Nirvana fan (6)

'fan' is the definition.
I know nothing about this answer so I can't judge whether this works.

'party finishing early had perplexed nirvana' is the wordplay.
'party' becomes 'side' (eg a side or party in a contract).
'finishing early' means to remove the last letter (the word finishes earlier than normal).
'had' means one lot of letters go next to another.
'perplexed nirvana' becomes 'dha' (I can't explain this - if you can you should give a lot more credence to this answer).
'side' with its last letter removed is 'sid'.
'sid'+'dha'='SIDDHA'

Can you help me to learn more?