A great deal of clothing (3)
I believe the answer is:
lot
'a great deal' is the definition.
(both can mean a large amount)
'of clothing' is the wordplay.
'of' indicates a hidden word.
'LOT' is hidden in the letters of 'clothing'.
(Other definitions for lot that I've seen before include "Nephew of Abraham - batch" , "Parcel - collection" , "His Biblical wife was turned to a pillar of salt" , "Chance; item for sale" , "Portion in life" .)