Good-looking workmen arrive topless (8)
I believe the answer is:
handsome
'good-looking' is the definition.
('handsome' can be a synonym of 'good-looking')
'workmen arrive topless' is the wordplay.
'workmen' becomes 'hands' (hand is a kind of workman).
'arrive' becomes 'come' (coming is a kind of arriving).
'topless' means to remove the first letter.
'come' with its initial letter taken off is 'ome'.
'hands'+'ome'='HANDSOME'
(Other definitions for handsome that I've seen before include "Striking" , "Goodly" , "Pleasing to see" , "Good-looking, as a male say" , "'Good-looking, as a man might be (8)'" .)