Pivoted bladed weapon for Ken if injured following knave (9)
I believe the answer is:
jackknife
'pivoted bladed weapon for ken if injured following knave' is the definition.
I can't tell whether this defines the answer.
'ken if injured following knave' is the wordplay.
'injured' indicates anagramming the letters.
'following' is a charade indicator (letters next to each other).
'knave' becomes 'jack' (synonyms).
'ken'+'if'='kenif'
'kenif' is an anagram of 'knife'.
'knife' put after 'jack' is 'JACKKNIFE'.
Can you help me to learn more?
(Other definitions for jackknife that I've seen before include "Double up out of control (of articulated lorries)" , "Cutter needed" , "(Articulated) vehicular doubling up" , "Swing out of control (as trailer of lorry)" , "Go out of control" .)