Act on stage (9)

I think it could be either:

Which length description are you looking for?:

5,3,6

represent

'act' is the definition.
(I know that act can be written as represent)

'on stage' is the wordplay.
'on' becomes 're' (regarding).
'stage' becomes 'present' (present can mean to stage or put on).
're'+'present'='REPRESENT'

(Other definitions for represent that I've seen before include "Play the part" , "Serve as a symbol for" , "Illustrate" , "Act for" , "Ambassadors do it" .)

I've seen this clue in The Guardian.

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