Lived up to the reckless fellow (5)
I believe the answer is:
devil
'the reckless fellow' is the definition.
'devil' can be an answer for 'fellow' (thesaurus). I'm not sure about the 'the reckless' bit.
'lived up' is the wordplay.
'up' is a reversal indicator (in down clue: letters go upwards).
'lived' backwards is 'DEVIL'.
'to' is the link.
Can you help me to learn more?
(Other definitions for devil that I've seen before include "Coat spicily; do hackwork" , "Old Nick, Satan" , "See 11" , "Evil supernatural being" , "Lived with Satan" .)