Composed a nicer song in the garden (9)
I believe the answer is:
cineraria
'the garden' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see an association between them that I can't see?
'composed a nicer song' is the wordplay.
'composed' indicates anagramming the letters.
'song' becomes 'aria' (piece of music in an opera).
'nicer' with letters rearranged gives 'ciner'.
'ciner'+'aria'='CINERARIA'
'in' is the link.
Can you help me to learn more?
(Other definitions for cineraria that I've seen before include "Composite plant" , "found in garden centre" , "Daisy" .)