Nick's riverside party (5)

I believe the answer is:

faldo

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'nick's' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'riverside party' is the wordplay.
'riverside' becomes 'fal' (I can't justify this - if you can you should believe this answer much more).
'party' becomes 'do' (do is a kind of party).
'fal'+'do'='FALDO'

Can you help me to learn more?

(Other definitions for faldo that I've seen before include "Winner of the 1987, 1990 and 1992 Open" , "Nick --, golfer" .)

I've seen this clue in the Evening Standard.

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