Crossword Genius

Westward chasm - a dale’s narrowness - enthralls wilderness artist (5,5)

Ross

I believe the answer is:

ansel adams

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'narrowness enthralls wilderness artist' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'westward chasm a dale's' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is located in the answer.
an anagram of 'dale' is 'elad' which is present in the answer.
This may be the basis of the clue (or it may be nonsense).

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I've seen this clue in the Sydney Morning Herald.
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