Sponge enclosure has delicately tipped contents (5)
I believe the answer is:
cadge
'sponge' is the definition.
(I know that sponge can be written as cadge)
'enclosure has delicately tipped contents' is the wordplay.
'enclosure' becomes 'cage' (cage is a kind of enclosure).
'has' is an insertion indicator.
'delicately tipped contents' becomes 'd' (I can't justify this - if you can you should give a lot more credence to this answer).
'cage' placed around 'd' is 'CADGE'.
Can you help me to learn more?
(Other definitions for cadge that I've seen before include "Go about begging, scrounge" , "Caged (anag.)" , "Scrouge, ask for" , "Sponge (eg money)" , "Bum" .)