Does this clue irk the more fortunate? (7)

I believe the answer is:

luckier

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'the more fortunate?' is the definition.
(I've seen this in another clue)

'does this clue irk' is the wordplay.
'clue irk' anagrams to 'LUCKIER'.
But, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for luckier that I've seen before include "More fortunate" , "More jammy" .)

I've seen this clue in The Irish Independent.

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