Sole (4)
'sole' is the definition.
(I know that sole can be written as only)
This is all the clue.
(Other definitions for only that I've seen before include "And nothing more; sole" , "See 6" , "Alone; solitary" , "Solely; except that" , "Mere" .)
'sole' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for one that I've seen before include "Single, unitary" , "Sole; identical" , "If upper-class, perhaps I" , "Unit" , "Ace" .)