Crossword Genius

Spawning place for radical daughter (4)

Ross

I believe the answer is:

rudd

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'spawning place' is the definition.
I can't judge whether this definition defines the answer.

'radical daughter' is the wordplay.
'radical' becomes 'rud' (I can't justify this - if you can you should give a lot more credence to this answer).
'daughter' becomes 'd' (genealogical abbreviation).
'rud'+'d'='RUDD'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for rudd that I've seen before include "Red-eye fish" , "Swimmer" , "Freshwater fish of the carp family" , "European freshwater fish" , "Freshwater fish (silvery with red fins)" .)

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