People inside Blair is harassing (5)
I believe the answer is:
irish
'people' is the definition.
(the Irish are the people of Ireland)
'inside blair is harassing' is the wordplay.
'inside' says the answer is hidden in the clue.
'IRISH' is hidden within 'blair is harassing'.
(Other definitions for irish that I've seen before include "Sort of coffee, stew or terrier" , "Kind of whiskey" , "Hi, Sir, ar you a Celt?" , "Joyce was" , "From Dublin, perhaps" .)