Predatory flapper is cruel bride, Spooner said (5,7)

I believe the answer is:

marsh harrier

I'm a little stuck... Click here to teach me more about this clue!

'predatory flapper' is the definition.
'marsh harrier' can be an answer for 'flapper' (marsh harrier is a kind of birdanimal). I'm not sure about the 'predatory' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for marsh harrier that I've seen is " Bird of prey".)

I've seen this clue in The Independent.

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