Star ego bruised in boxing? (7)

I believe the answer is:

storage

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'boxing?' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for storage that I've seen before include "reservation?" , "Cost of keeping in a warehouse" , "Longer-term laying up" , "What repository provides; so great (anag.)" , "- Heater; - battery" .)

I've seen this clue in The Sun.

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