Enduring, repent about capturing chap (9)
I believe the answer is:
permanent
'enduring' is the definition.
(similar in meaning)
'repent about capturing chap' is the wordplay.
'about' is an anagram indicator.
'capturing' is an insertion indicator.
'chap' becomes 'man' (chap can mean a man).
'repent' is an anagram of 'perent'.
'perent' going around 'man' is 'PERMANENT'.
(Other definitions for permanent that I've seen before include "Lasting, durable" , "indestructible" , "Unchanging" , "Meant to remain indefinitely" , "This way for the track" .)