Caught part of ladder becoming twisted (5)
I believe the answer is:
wrung
'twisted' is the definition.
(wringing is a kind of twisting)
'caught part of ladder' is the wordplay.
'caught' indicates a 'sounds like' (homophone) clue (to catch something can mean to hear it).
'part of ladder' becomes 'rung' ('rung' is part of 'ladder').
'rung' sounds like 'WRUNG'.
'becoming' acts as a link.
(Other definitions for wrung that I've seen before include "Squeezed and twisted" , "Coerced" , "Twisted and compressed" .)