Invasion (9)

I think it could be either:

Which length description are you looking for?:

incursion

'invasion' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for incursion that I've seen before include "Foray" , "Sudden attack" , "Attack made into enemy territory" , "Hostile raid" .)

I've seen this clue in The Times.

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