A cute oval made into steam vessel (9)
I believe the answer is:
autoclave
'steam vessel' is the definition.
'autoclave' can be an answer for 'vessel' (autoclave is a kind of vessel). I'm not sure about the 'steam' bit.
'a cute oval made' is the wordplay.
'made' indicates an anagram.
'cute'+'oval'='cuteoval'
'cuteoval' with letters rearranged gives 'utoclave'.
'a'+'utoclave'='AUTOCLAVE'
'into' acts as a link.
Can you help me to learn more?
(Other definitions for autoclave that I've seen before include "Surgical instruments steriliser" , "Vessel for, eg, steam sterilisation" , "In which you'd get boiling hot" .)