Decrepit, frail and bent (5)
I believe the answer is:
flair
'bent' is the definition.
(I've seen this before)
'decrepit frail' is the wordplay.
'decrepit' indicates anagramming the letters.
'frail' anagrammed gives 'FLAIR'.
'and' is the link.
(Other definitions for flair that I've seen before include "Style, panache" , "Intuitive discernment" , "?lan, dash" , "Creative brilliance" , "Natural ability to do something well (5)" .)