Study text of play, perhaps, one about call-up (12)

I believe the answer is:

conscription

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'call-up' is the definition.
(thesaurus)

'study text of play perhaps one about' is the wordplay.
'study' becomes 'con' (con can mean to study).
'text' becomes 'script' (I've seen this before).
'of' becomes 'o''.
'play perhaps' becomes 'in' (I can't justify this - if you can you should believe this answer much more).
'one about' means one lot of letters goes inside another.
'o' going inside 'in' is 'ion'.
'con'+'script'+'ion'='CONSCRIPTION'

Can you help me to learn more?

(Other definitions for conscription that I've seen before include "Draft" , "Compulsory enlistment" .)

I've seen this clue in The Times.

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