Looking for oil may be tedious (6)

I believe the answer is:

boring

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'tedious' is the definition.
(I know that tedious can be written as boring)

I can't explain the rest of the clue.

(Other definitions for boring that I've seen before include "Drilling - it's monotonous" , "Tedious, tiresome" , "Mentally wearying" , "Tedious, of no interest" , "Making holes" .)

I've seen this clue in The Irish News.

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