The most common and most likely answer to this crossword clue is the 7 letter word STANNIC
I've seen this crossword clue in The Times
S
T
A
N
N
I
C
More clues leading to the result STANNIC
Buddy explains!

The straight part
We know that "Capable of making tin cans" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case capable of making tin cans = stannic.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does STANNIC mean?
STANNIC adjective- Containing tetravalent tin.
- Containing tetravalent tin.