Entirety? Small amount would be healthy (9)
I believe the answer is:
wholesome
'healthy' is the definition.
(associated in meaning)
'entirety? small amount' is the wordplay.
'entirety? small' becomes 'whole' (I can't explain this - if you can you should believe this answer much more).
'amount' becomes 'some'.
'whole'+'some'='WHOLESOME'
'would be' is the link.
Can you help me to learn more?
(Other definitions for wholesome that I've seen before include "Previously propitious" , "Beneficial" , "Respectable" , "Healthy in body, taste or morals" , "Moral" .)