Trust developed in walk (5)
I believe the answer is:
strut
'walk' is the definition.
(strut is a kind of walk)
'trust developed' is the wordplay.
'developed' indicates an anagram.
'trust' with letters rearranged gives 'STRUT'.
'in' acts as a link.
(Other definitions for strut that I've seen before include "supporter" , "Take vain steps" , "Walk proudly like bantam-cock" , "Prop; prance" , "swaggering gait" .)