They support various trusts (6)
I believe the answer is:
struts
'they support' is the definition.
(I've seen this before)
'various trusts' is the wordplay.
'various' is an anagram indicator.
'trusts' anagrammed gives 'STRUTS'.
(Other definitions for struts that I've seen before include "parades with conscious pride" , "Walks proudly with support braces" , "Strengthening bars" , "arrogant motions" , "Bars inserted into framework to strengthen it" .)