Tip up open vase (8)
I believe the answer is:
overturn
'tip' is the definition.
(I've seen this before)
'up open vase' is the wordplay.
'up open' becomes 'overt' (synonyms. I am not sure about the 'up' bit.).
'vase' becomes 'urn' (both can mean a container).
'overt'+'urn'='OVERTURN'
Can you help me to learn more?
(Other definitions for overturn that I've seen before include "Reverse (legal ruling)" , "Empty out" , "Topple or capsize" , "Reverse or capsize" , "Upset; abolish" .)