Crossword Genius

Metals causing difficulty (4)

Ross

I believe the answer is:

snag

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'difficulty' is the definition.
(snag is a kind of difficulty)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for snag that I've seen before include "Unexpected drawback" , "Tear - catch" , "Stumbling block" , "Unforeseen obstacle" , "A hidden or unexpected obstacle" .)

I've seen this clue in The Sun.
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