Crossword Genius

It's apt to arise on the south side (5)

Ross

I believe the answer is:

steam

I'm a little stuck... Click here to teach me more about this clue!

'it's apt to arise' is the definition.
I can't tell whether this definition defines the answer.

'on the south side' is the wordplay.
'on' is a charade indicator (letters next to each other).
'the south' becomes 's' (abbreviation).
'side' becomes 'team' (a side is a sporting team).
's'+'team' is 'STEAM'.

Can you help me to learn more?

(Other definitions for steam that I've seen before include "letter opener?" , "A lot of hot air" , "Energy (colloq.)" , "Gas from boiliing water" , "Like old radio" .)

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