Pirate scattered armed guard, out of bounds (8)
I believe the answer is:
marauder
'pirate' is the definition.
(thesaurus)
'scattered armed guard out of bounds' is the wordplay.
'scattered' indicates anagramming the letters.
'out of bounds' indicates the central letters (the bounds or edges of the word are removed).
The central letters of 'guard' are 'uar'.
'armed'+'uar'='armeduar'
'armeduar' anagrammed gives 'MARAUDER'.
(Other definitions for marauder that I've seen before include "One wandering in search of prey or loot" , "Brigand" , "Roving robber" , "One going about stealing or attacking" , "Raider" .)