Rescue flailing Truss (6)
I believe the answer is:
secure
'truss' is the definition.
(I know that truss is a more specific form of the action bind)
'rescue flailing' is the wordplay.
'flailing' is an anagram indicator.
'rescue' is an anagram of 'SECURE'.
(Other definitions for secure that I've seen before include "Safe; make fast" , "Seize; make fast" , "Firmly in place - free from danger" , "Safe, free from danger" , "Free from danger and financially sound" .)