Crossword Genius

Charitable club go off on a railway (6)

Ross

I believe the answer is:

rotary

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'charitable club' is the definition.
'Rotary' can be an answer for 'club' (Rotary Club is an example). I'm unsure of the 'charitable' bit.

'go off on a railway' is the wordplay.
'go off' becomes 'rot' (as in food going off).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'railway' becomes 'ry' (abbreviation for railway).
'rot'+'a'+'ry'='ROTARY'

Can you help me to learn more?

(Other definitions for rotary that I've seen before include "Gyratory" , "Sort of club" , "Spinning" , "Revolving (like a club?)" , "Moving in a circle" .)

I've seen this clue in The Times.
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