Like those old Johnnies in the stage door? (4)

I believe the answer is:

aged

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'like those old johnnies' is the definition.
I can't judge whether this defines the answer.

'in the stage door?' is the wordplay.
'in' indicates a hidden word.
'AGED' is hidden in the letters of 'stage door'.

Can you help me to learn more?

(Other definitions for aged that I've seen before include "Long in the tooth" , "Became older" , "Grew older" , "not like a callow youth" , "Mature" .)

I've seen this clue in the Evening Standard.

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