Legless one on a bender it turned out (10)
I believe the answer is:
inebriated
'legless' is the definition.
(both can mean drunk)
'one on a bender it turned out' is the wordplay.
'one' becomes 'i' (Roman numeral**).
'on' says to put letters next to each other.
'turned out' is an anagram indicator.
'a'+'bender'+'it'='abenderit'
'abenderit' anagrammed gives 'nebriated'.
'i'+'nebriated'='INEBRIATED'
(Other definitions for inebriated that I've seen before include "wasted" , "Bombed" , "Tipsy" , "Drunk" .)