Precipitate invasion seizing power (5)
I believe the answer is:
rapid
'precipitate' is the definition.
(thesaurus)
'invasion seizing power' is the wordplay.
'invasion' becomes 'raid' (I've seen this before).
'seizing' is an insertion indicator.
'power' becomes 'p'.
'raid' going around 'p' is 'RAPID'.
(Other definitions for rapid that I've seen before include "Zippy" , "Speedy, quick" , "Happening quickly" , "Quick or swift" , "haste" .)