Crossword Genius

God wants daughter to protect bird forever (8)

Ross

I believe the answer is:

eternity

'forever' is the definition.
(synonyms)

'god wants daughter to protect bird' is the wordplay.
I cannot quite understand how this works, but
'bird' could be 'tern' (tern is a kind of bird) and 'tern' is present in the answer.
This explanation may well be incorrect...

(Other definitions for eternity that I've seen before include "Endless duration" , "That's a very long time" , "Endless time" , "An extremely long time" , "Wolfgang Amadeus -" .)

I've seen this clue in The Guardian.
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