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They fly although they are powerless to do so (7)

Ross

I believe the answer is:

gliders

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

'they' is the definition.
Both the definition and answer are plural nouns.
Maybe you can see an association between them that I don't see?

'fly although they are powerless to do so' is the wordplay.
I cannot really understand how this works, but
'fly' could be 'glide' (gliding is a kind of flying) and 'glide' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for gliders that I've seen is " Flying vehicles without engines".)

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