Moving around less can be malicious (10)
I believe the answer is:
slanderous
'be malicious' is the definition.
(I've seen this before)
'moving around less' is the wordplay.
'moving' indicates anagramming the letters (letters are moved around).
'around'+'less'='aroundless'
'aroundless' anagrammed gives 'SLANDEROUS'.
'can' is the link.
(Other definitions for slanderous that I've seen before include "Done as slur (anag)" , "Defamatory" , "smear" , "Malicious" .)