Someone of less than stellar status, a continuing irritation? (7)
I believe the answer is:
blister
'someone' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for blister that I've seen before include "Give hair dryer treatment" , "Bubble on the skin filled with fluid" , "lump on skin" , "Bristle (anag.)" , "Result of friction" .)