Previous character in audition, await your turn (4,1,5)

I think it could be either:

Which length description are you looking for?:

4,1,5

form

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'turn' is the definition.
(thesaurus)

'previous character' is the wordplay.
'previous' becomes 'for' (I can't justify this - if you can you should believe this answer much more).
'character' becomes 'm'.
'for'+'m'='FORM'

'in audition await your' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for form that I've seen before include "Visible shape, class" , "Make" , "Group of schoolchildren < > construct" , "Hare's home - something to be filled in" , "A hare's hide-out" .)

I've seen this clue in The Guardian.

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