Container for various cakes on the top of the tray (6)
I believe the answer is:
casket
'container' is the definition.
(casket is a kind of container)
'various cakes on the top of the tray' is the wordplay.
'various' indicates an anagram.
'on' means one lot of letters go next to another.
'the top of' suggests taking the first letters.
The first letter of 'tray' is 't'.
'cakes' is an anagram of 'caske'.
'caske'+'t'='CASKET'
'for' acts as a link.
(Other definitions for casket that I've seen before include "Coffin or jewellery box" , "Small box to hold jewels" , "Small box for holding jewellery" , "Jewel box" , "Small box for valuables" .)