Initially calming Bob, we moved spider's trap (6)
I believe the answer is:
cobweb
'spider's trap' is the definition.
(I've seen this before)
'initially calming bob we moved' is the wordplay.
'initially' says to take the initial letters.
'moved' is an anagram indicator.
The initial letter of 'calming' is 'c'.
'bob'+'we'='bobwe'
'bobwe' with letters rearranged gives 'obweb'.
'c'+'obweb'='COBWEB'
(Other definitions for cobweb that I've seen before include "Elaborate formation of filaments made by spiders" , "Dusty silken network" , "that's gathering dust?" , "Dust-covered network" , "Net made by a spider to catch insects" .)