One condemned lad felt unlucky (3-5)
I believe the answer is:
ill-fated
'unlucky' is the definition.
(I know that unlucky can be written as ill-fated)
'one condemned lad felt' is the wordplay.
'one' becomes 'i' (Roman numeral).
'condemned' is an anagram indicator.
'lad'+'felt'='ladfelt'
'ladfelt' is an anagram of 'llfated'.
'i'+'llfated'='ILL-FATED'
(Other definitions for ill-fated that I've seen before include "Unlucky, bad times ahead" , "Unlucky, destined to lose" , "Destined to fail" , "Doomed(3.5)" , "'Doomed, unlucky (3-5)'" .)