11 across
Copper
and
iron
for
example
in
mass
with
the
others
in
depots
(4,6)
Copper and iron for example in mass with the others in depots (4,6)
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The definition is at the beginning of the clue.
How the clue works
Copper and iron for example is your definition — they're classic base metals. For the wordplay, take depots which gives you BASES, but split that as BASE and S, then slot in M for mass, and ET AL for the others, and you've got BASE + M + ETAL + S all knitting together to make the answer.