Sheepish sort plastered in Rome (6)
I believe the answer is:
merino
'sheepish sort' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'plastered in rome' is the wordplay.
'in rome' anagrams to 'MERINO'.
But, I am not sure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for merino that I've seen before include "The sheep provides fine wool" , "No rime for this sheep" , "Spanish breed of sheep with high quality fleece" , "Sheep with fine quality fleece" , "Long-haired sheep" .)