Dams to protect the same odd fish (7)

I believe the answer is:

weirdos

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'dams to protect the same odd fish' is the definition.
I can't judge whether this definition defines the answer.

'dams to protect the same' is the wordplay.
'dams' becomes 'weirs' (weir is a kind of dam).
'to protect' indicates putting letters inside (inserted letters are held or protected).
'the same' becomes 'do' (abbreviation for ditto).
'weirs' going around 'do' is 'WEIRDOS'.

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I've seen this clue in The Sunday Times and The Times.

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