Containing iron (6)

I think it could be either:

Which length description are you looking for?:

ferric

'containing iron' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for ferric that I've seen before include "made of iron" , "Of iron with a valency of three" , "Relating to one form of iron" , "Containing iron" , "Of trivalent iron" .)

I've seen this clue in the Universal and The Guardian.

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