7 down
Take
responsibility
for
diatomic
carbon,
they
said
(3,2)
Take responsibility for diatomic carbon, they said (3,2)
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The definition is at the beginning of the clue.
How the clue works
The definition is Take responsibility for — to see to something means to handle or deal with it. Diatomic carbon is C2 (that's the chemical symbol C, with two atoms), and "they said" is your homophone indicator, so you say "C two" out loud and it sounds exactly like SEE TO.