Moving struts, I'm showing suspicion (8)
I believe the answer is:
mistrust
'suspicion' is the definition.
(synonyms)
'moving struts i'm' is the wordplay.
'moving' indicates anagramming the letters (letters are moved around).
'struts'+'im'='strutsim'
'strutsim' is an anagram of 'MISTRUST'.
'showing' is the link.
(Other definitions for mistrust that I've seen before include "Lack of belief (in someone)" , "Regard with suspicion" , "Suspect (someone)" , "Have doubts about" , "Have no confidence in (someone)" .)