Part inside reactor now ripped open (4)

I believe the answer is:

torn

I'm a little stuck... Click here to teach me more about this clue!

'ripped open' is the definition.
'torn' can be an answer for 'ripped' (I've seen this in another clue). I am not sure about the 'open' bit.

'part inside reactor now' is the wordplay.
'part' indicates the answer is hidden within the clue.
'TORN' can be found hidden inside 'inside reactor now'.

Can you help me to learn more?

(Other definitions for torn that I've seen before include "Divided" , "Undecided between two" , "Lacerated - in two minds" , "'-- Curtain', 1966 Hitchcock film" , "Ragged" .)

I've seen this clue in The Sun.

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