Trust belief, scattering insects (11)
I believe the answer is:
butterflies
'insects' is the definition.
(butterfly is a kind of insect)
'trust belief scattering' is the wordplay.
'scattering' indicates anagramming the letters.
'trust'+'belief'='trustbelief'
'trustbelief' is an anagram of 'BUTTERFLIES'.
(Other definitions for butterflies that I've seen before include "Nervous tremors in the stomach" , "Nervous sensation" , "insects?" , "Nervous feeling in stomach" , "coppers?" .)