They have big clothes items old boy stuffed in drawers inappropriately (9)
I believe the answer is:
wardrobes
'they have big clothes items' is the definition.
(wardrobes store large items of clothing)
'old boy stuffed in drawers inappropriately' is the wordplay.
'old boy' becomes 'ob' (abbreviation).
'stuffed in' indicates putting letters inside.
'inappropriately' indicates an anagram (I've seen this in other clues).
'drawers' with letters rearranged gives 'wardres'.
'ob' inserted inside 'wardres' is 'WARDROBES'.
(Another definition for wardrobes that I've seen is " furniture".)