Not smooth, frumpily dressed Irish men kicked out? (5)

I believe the answer is:
lumpy
'not smooth' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for lumpy that I've seen before include "Clotted; knobbly" , "Covered in swellings" , "Choppy" , "As badly mixed custard" , "Uneven in texture" .)