More than one flier cries with energy in decline (7)

I believe the answer is:

shrikes

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

'more than one flier' is the definition.
(shrike is a kind of bird)

'cries with energy in decline' is the wordplay.
I cannot quite see how this works, but
'energy' could be 'ke' (K.E. is an example) and 'ke' is located in the answer.
This explanation may well be incorrect...

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I've seen this clue in The Times.

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