Gym ball (4)

I believe the answer is:

prom

'gym ball?' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for prom that I've seen before include "School ball (N America)" , "Short walk" , "Albert Hall concert" , "Seaside walk (abbr.)" , "Concert; US college dance" .)

I've seen this clue in the Penny Press and the Newsday.

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