Only individual, say (4)
I believe the answer is:
sole
This could be a double definition.
'only' is the first definition.
(synonyms)
'individual say' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
Can you help me to learn more?
(Other definitions for sole that I've seen before include "Exclusive class of fish" , "A lone sort of fish - lose it" , "A lonely sort of flatfish" , "Bottom of the foot" , "A lone flat fish?" .)