MP interrupts girl about to shut up (8)

I believe the answer is:

imprison

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'shut up' is the definition.
(I've seen this before)

'mp interrupts girl about to' is the wordplay.
'interrupts' means one lot of letters goes inside another.
'girl' becomes 'Iris' (girl's name).
'about to' becomes 'on' (I am not sure about this - if you are sure you should believe this answer much more).
'mp' placed into 'iris' is 'impris'.
'impris'+'on'='IMPRISON'

Can you help me to learn more?

(Other definitions for imprison that I've seen before include "Place in custody" , "Put in jail" , "Detain" , "Purveyor of blooms" , "Put behind bars" .)

I've seen this clue in The Sun.

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