Chemist has nothing in cracked vials? That is right (9)
I believe the answer is:
'chemist' is the definition.
(I know that Lavoisier is a chemist)
'nothing in cracked vials? that is right' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'in' means one lot of letters goes inside another.
'cracked' indicates an anagram.
'that is' becomes 'ie' (abbreviation for id est, 'that is' in Latin).
'right' becomes 'r' (common abbreviation).
'vials' anagrammed gives '[vials]'.
'o' put within 'lavisier' is 'LAVOISIER'.
'has' acts as a link.
(Another definition for lavoisier that I've seen is " Antoine, eighteenth century French chemist and physicist".)