Eagle never crossing valley (4)

I believe the answer is:

glen

'valley' is the definition.
(I know that glen is a type of valley)

'eagle never crossing' is the wordplay.
'crossing' indicates a hidden word (the clue crosses over the answer).
'GLEN' is hidden in the letters of 'eagle never'.

(Other definitions for glen that I've seen before include "Narrow secluded valley in mountains" , "Narrow Scots valley" , "Valley, dale" , "Depression in Scotland" , "Long narrow valley in Scotland" .)

I've seen this clue in The Guardian.

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