Individual, sole (6)
I believe the answer is:
single
I believe this is a double definition.
'individual' is the first definition.
'sole' is the second definition.
(similar in meaning)
(Other definitions for single that I've seen before include "Unique" , "Only one; record" , "Unattached" , "Concentrating on only one aim" , "A hit for one run in cricket" .)