Leading Grampian location, especially Nevis! (4)

I believe the answer is:

glen

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'leading grampian location especially nevis' is the definition.
I can't judge whether this defines the answer.

'leading grampian location especially nevis' is the wordplay.
'leading' suggests taking the first letters.
The initial letters of 'grampian location especially nevis' is 'GLEN'.

Can you help me to learn more?

(Other definitions for glen that I've seen before include "Valley, dale" , "Narrow Scots valley" , "Highland valley" , "Narrow secluded valley in mountains" , "Campbell perhaps" .)

I've seen this clue in The Guardian.

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