For station worker, Nicholson a bounder (8)
I believe the answer is:
jackaroo
'for station' is the definition.
The definition suggests a singular noun which matches the answer.
'worker nicholson a bounder' is the wordplay.
'worker nicholson' becomes 'jack' (I can't explain this - if you can you should believe this answer much more).
'bounder' becomes 'roo' (short for kangaroo, something which bounds).
'jack'+'a'+'roo'='JACKAROO'
Can you help me to learn more?
(Another definition for jackaroo that I've seen is " Australian trainee".)