Dead accurate when making a container (7)
I believe the answer is:
extinct
'dead' is the definition.
(similar in meaning)
'accurate when making a container' is the wordplay.
I cannot quite see how this works, but
'container' could be 'tin' (tin is a kind of container) and 'tin' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for extinct that I've seen before include "(Species) lost" , "(Of a volcano) dead" , "Wiped out" , "Having died out, like the dinosaur" , "Having died out, animal species or volcano" .)