Rigs that collapsed not bent (8)
I believe the answer is:
straight
'not bent' is the definition.
(bent can mean crooked or not straight)
'rigs that collapsed' is the wordplay.
'collapsed' indicates an anagram.
'rigs'+'that'='rigsthat'
'rigsthat' with letters rearranged gives 'STRAIGHT'.
(Other definitions for straight that I've seen before include "Unswerving" , "Without curve or bend" , "Neat (of drinks)" , "in a row" , "Poker hand of five consecutive cards" .)