Proprietor of farm, say, left warden no alternative (9)
I believe the answer is:
landowner
'proprietor of farm' is the definition.
'landowner' can be an answer for 'proprietor' (thesaurus). I'm not certain of the 'of farm' bit.
'left warden no alternative' is the wordplay.
'left' becomes 'l' (common abbreviation).
'alternative' indicates an anagram (an alternative ordering of the letters).
'warden'+'no'='wardenno'
'wardenno' anagrammed gives 'andowner'.
'l'+'andowner'='LANDOWNER'
'say' acts as a link.
Can you help me to learn more?
(Other definitions for landowner that I've seen before include "One may have lots of grass" , "man of property" , "Laird" , "Squire, perhaps" , "One with much property" .)