Platform One at northern station - note crush (9)
I believe the answer is:
'platform one' is the definition.
I know nothing about this answer so I can't judge whether this works.
'at northern station note crush' is the wordplay.
I cannot quite see how this works, but
'at' could be 'in' (synonymous in some cases - eg at school, in school) and 'in' is present in the answer.
'station' could be 'sta' (I have seen 'Short station' mean 'sta' so perhaps 'station' could also mean 'sta') and 'sta' is found within the answer.
'note' could be 'g' (musical note) and 'g' is located in the answer.
The remaining letters 'ram' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?