Ran riot. Raged about changed map (8)
I believe the answer is:
'ran riot' is the definition.
(I've seen this before)
'raged about changed map' is the wordplay.
'about' means one lot of letters goes inside another.
'changed' indicates anagramming the letters.
'map' anagrammed gives 'mpa'.
'raged' placed around 'mpa' is 'RAMPAGED'.
(Other definitions for rampaged that I've seen before include "ran amok" , "Charged" , "Went berserk" , "ran riot" , "Rushed wildly" .)