Still it acts in a strange way (6)
I believe the answer is:
static
'still' is the definition.
(static can mean still or not moving)
'it acts in a strange way' is the wordplay.
'in a strange way' indicates anagramming the letters (I've seen this in other clues).
'it'+'acts'='itacts'
'itacts' is an anagram of 'STATIC'.
(Other definitions for static that I've seen before include "Crakling or hissing noise caused by electrical interference" , "Crackling or hissing noise caused by electrical interference" , "Lacking movement or action" , "showing no signs of going anywhere" , "Inert or passive, like some electricity" .)