Dairy producer’s left one soft primula veris (7)
I believe the answer is:
cowslip
'primula veris' is the definition.
(synonyms)
'dairy producer's left one soft' is the wordplay.
'dairy producer's' becomes 'cows' (I can't explain this - if you can you should believe this answer much more).
'left' becomes 'l' (common abbreviation).
'one' becomes 'i' (Roman numeral).
'soft' becomes 'p' (musical abbreviation for 'piano', soft).
'cows'+'l'+'i'+'p'='COWSLIP'
Can you help me to learn more?
(Other definitions for cowslip that I've seen before include "Yellow spring flower" , "Wild yellow primula" , "Yellow flower for unsteady bovine?" , "Yellow field flower" , "Pretty little wild flower for unsteady bovine" .)