Soft
'soft' is the definition.
(I know that soft can be written as gentle)
This is all the clue.
(Other definitions for gentle that I've seen before include "Jane Eyre's kind person with a book? -- eternal greed (anag)" , "Not stern, coarse or violent" , "Not violent, tender" , "Kind-natured" , "Mild; a maggot" .)
'soft' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for yielding that I've seen before include "Succumbing" , "Soft, rather than rigid" , "surrender" , "that's not iron?" , "Backing down" .)
'soft' is the definition.
(I know that soft can be written as piano)
This is the entire clue.
(Other definitions for piano that I've seen before include "Softly, musically speaking" , "Clavier" , "Instrument with ivories" , "Upright type?" , "Soft - musical instrument" .)