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Hemingway ignores why this is hard to fathom (6)

Ross

I believe the answer is:

enigma

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

'fathom' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'hemingway ignores why this is hard' is the wordplay.
'ignores' is a deletion indicator.
'this is hard' is an anagram indicator.
'hemingway' with 'why' taken out is 'eminga'.
'eminga' is an anagram of 'ENIGMA'.

'to' is the link.

Can you help me to learn more?

(Other definitions for enigma that I've seen before include "WW two Ger. code device; puzzle" , "German military cipher machine" , "WW2 code" , "Coding device" , "Puzzle for gaming" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.
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