One wool-gathering artist reversed gauzy clothes (7)
I believe the answer is:
shearer
'one wool-gathering' is the definition.
(someone shearing a sheep's wool)
'artist reversed gauzy clothes' is the wordplay.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'reversed' shows that the letters should be reversed in order.
'gauzy' becomes 'sheer' (synonyms).
'clothes' indicates putting letters inside.
'ra' reversed gives 'ar'.
'ar' put within 'sheer' is 'SHEARER'.
(Other definitions for shearer that I've seen before include "Wool cutter - ex-England footballer" , "Sheep's wool cutter" , "He cuts the fleece from sheep" , "one who removes coat" , "Sheep barber?" .)