Crossword Genius

Acceptable target in 'Test Your Strength' or 'Hook a Duck'? (4,4)

Ross

I believe the answer is:

fair game

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'acceptable target' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for fair game that I've seen before include "Hoop-la may be" , "Legitimate objects for attack" , "Suitable target" , "Fear magi with legitimate target" , "Legitimate target like blonde animal" .)

I've seen this clue in The Telegraph.
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