Invade some forbidden territory (5)

I believe the answer is:

enter

'invade' is the definition.
(I know that invade is a more specific form of the action enter)

'some forbidden territory' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'ENTER' can be found hidden inside 'forbidden territory'.

(Other definitions for enter that I've seen before include "Make a record of" , "Enlist, join up" , "Treen (anag.)" , "Come/go in" , "Fruit drink" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app