Huge moose run all over the place (8)
I believe the answer is:
enormous
'huge' is the definition.
('enormous' can be a synonym of 'huge')
'moose run all over the place' is the wordplay.
'all over the place' indicates an anagram.
'moose'+'run'='mooserun'
'mooserun' anagrammed gives 'ENORMOUS'.
(Other definitions for enormous that I've seen before include "Unusually large - jumbo" , "Gross" , "Massive" , "Extra-large" , "Huge, really big" .)