Ignoring the odds, foiled haggler in their later years (3,3)
I believe the answer is:
old age
'years' is the definition.
(synonyms)
'ignoring the odds foiled haggler' is the wordplay.
'ignoring the odds' means one should take alternating letters (letters in odd-numbered positions are removed).
'foiled'+'haggler'='foiledhaggler'
The alternate letters of 'foiledhaggler' are 'OLD-AGE'.
'in their later' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for old age that I've seen before include "Advanced years" , "State of very senior citizens" , "Pensionable condition" , "Time near the end of life" , "time of one's life!" .)