Charging fan started the ultras running back out (5)

I believe the answer is:

turbo

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

'charging fan' is the definition.
I can't judge whether this defines the answer.

'started the ultras running back out' is the wordplay.
'started' says to take the initial letters.
The initial letters of 'the ultras running back out' is 'TURBO'.

Can you help me to learn more?

(Other definitions for turbo that I've seen before include "motor" , "Pub torpor (anag) - type of aircraft" , "Type of supercharger using engines exhaust gases" , "Gastropod" , "Powerful device" .)

I've seen this clue in The Irish Times.

Want a hint initially instead of a full solution? Install my app