Crossword Genius

Attacks with a 'furious fastid­iousness', ultimately — fine to ignore flaws (8)


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Here is my best explanation:

'attacks' is the definition.
('assault' can be a synonym of 'attack')

'ultimately fine to ignore flaws' is the wordplay.
'ultimately' becomes 'ass' (I am not sure about this - if you are sure you should believe this answer much more).
'fine' becomes 'f' (abbreviation).
'to ignore' suggests deleting specific letters.
'flaws' becomes 'faults' ('fault' can be a synonym of 'flaw').
'faults' with 'f' removed is 'aults'.

'with a furious fastidiousness' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

This clue was last seen in The Guardian