This involves hot water and some steam (3)
I believe the answer is:
tea
'this involves hot water' is the definition.
The definition suggests a singular noun which matches the answer.
'some steam' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'TEA' can be found hidden inside 'steam'.
'and' is the link.
Can you help me to learn more?
(Other definitions for tea that I've seen before include "Strangely, one may eat this drink" , "Meal/drink" , "Dried leaf infusion" , "- - for Two (song)" , "Assam or Darjeeling, for example" .)