Tradesman who spends a day on the tiles? (6)
I believe the answer is:
roofer
I believe this clue is a double definition.
'tradesman' is the first definition.
(a roofer is a tradesman)
'who spends a day on the tiles?' is the second definition.
(Other definitions for roofer that I've seen before include "One works on the top of a house" , "One putting top on building" , "eg Thatcher" , "High-level building worker" , "Person working on top of a house" .)