Crossword Genius

Creativity in Belfast, potentially on the rise in school (5)

Ross

I believe the answer is:

train

'school' is the definition.
(I know that school can be written as train)

I don't understand the remainder of the clue.

(Other definitions for train that I've seen before include "Line of railway cars with locomotive" , "Learn a skill etc. through practice" , "Prepare for public transport?" , "Choo-choo or part of wedding dress" , "Prepare oneself by exercising" .)

I've seen this clue in The Times.
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