A bed scattered with stash around its top part (9)

'top part' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'a bed scattered with stash around its' is the wordplay.
I cannot really see how this works, but
'a' is found in the answer.
an anagram of 'bed' is 'edb' which is present in the left over letters.
'stash' could be 'hoard' (synonyms) and 'hoard' is found within the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?