Stop evil AI getting back to planet (4)

I believe the answer is:

halt

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'stop' is the definition.
(halt can mean to stop)

'evil ai getting back to planet' is the wordplay.
'evil ai getting' becomes 'hal' (I can't explain this - if you can you should give a lot more credence to this answer).
'back to' indicates one should take the final letters.
The last letter of 'planet' is 't'.
'hal'+'t'='HALT'

Can you help me to learn more?

(Other definitions for halt that I've seen before include "Cease" , "Stop, small station" , "Stop; minor station" , "Stop or pause" , "Falter - stop" .)

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