Crossword Genius

Rain cloud cut short play after game (6)

Ross

I believe the answer is:

nimbus

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'rain cloud' is the definition.
(synonyms)

'cut short play after game' is the wordplay.
'cut short play' becomes 'bus' (I can't explain this - if you can you should believe this answer much more).
'after' is a charade indicator (letters next to each other).
'game' becomes 'nim' (mathematical game).
'bus' put after 'nim' is 'NIMBUS'.

Can you help me to learn more?

(Other definitions for nimbus that I've seen before include "Storm cloud" , "Is numb (anag)" , "showers under it" , "Type of rain cloud" , "Dark, rain-bearing cloud" .)

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