Torpedo displays a metal angle (7)

I believe the answer is:

tinfish

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'torpedo displays a' is the definition.
I can't tell whether this definition defines the answer.

'metal angle' is the wordplay.
'metal' becomes 'tin' (tin is a kind of metal).
'angle' becomes 'fish' (synonyms).
'tin'+'fish'='TINFISH'

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I've seen this clue in the Sydney Morning Herald.

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