Crossword Genius

Someone of less than stellar status, a continuing irritation? (7)

Ross

I believe the answer is:

blister

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Independent.
Want a hint initially instead of a full solution? Install my app