Crossword Genius

It's powerless to fly! (6)

Ross

I believe the answer is:

glider

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

'it's powerless' is the definition.
I can't tell whether this definition defines the answer.

'fly' is the wordplay.
I cannot really see how this works, but
'fly' could be 'glide' (gliding is a kind of flying) and 'glide' is located in the answer.
A single letter 'r' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

'to' acts as a link.

Can you help me to learn more?

(Other definitions for glider that I've seen before include "Girdle for silent flier" , "Unpowered plane" , "Plane supported by air" , "Powerless aircraft" , "Motorless plane" .)

I've seen this clue in the Evening Standard.
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