Quibble about problem ahead? (5,5)

I believe the answer is:

split hairs

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'quibble' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for split hairs that I've seen before include "Worry about minutiae" , "cavil exceedingly" , "Make pedantic distinctions" , "a trichologist may deal with" , "Make petty distinctions" .)

I've seen this clue in The Guardian.

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