Card/note perhaps for a flammable liquid (7)
I believe the answer is:
acetone
'liquid' is the definition.
(I have seen 'Inflammable liquid ' mean 'acetone' so perhaps 'liquid' could also mean 'acetone')
'cardnote perhaps for a flammable' is the wordplay.
I cannot really see how this works, but
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is present in the answer.
'a' is within the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for acetone that I've seen before include "Remover of nail polish" , "Common solvent" , "Paint thinner" , "Inflammable liquid" , "it dissolves" .)