Make an excursion ignoring Jack's relative (4)

I believe the answer is:

aunt

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'relative' is the definition.
(aunt is a type of relative)

I can't explain the rest of the clue.

(Other definitions for aunt that I've seen before include "Wife of one's uncle" , "Tuna gone bad for the relative" , "Charley's ___ , farce staged in London in 1892, revived and adapted ever since" , "Tuna (anag.)" , "Close relative" .)

I've seen this clue in The Independent.

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