Monday Express

[NatalieCrouc]

7d. High and inaccessible nest of an eagle. 5 letters

[BigMac]

EYRIE, perhaps?

[flamingo97]

Or others as per:

eyrie or eyry (also aerie, aery or ayrie), noun the nest of a bird of prey, especially an eagle; a house or stronghold perched on some high or steep place; any high or inaccessible place; the brood in the nest, or a stock of children (Shakespeare) (Chambers)