Conclusion can't be reached — sigh! (2,3,2,5)
I believe the answer is:
no end in sight
'conclusion can't be reached' is the definition.
(an end in sight is a conclusion)
I don't understand the remainder of the clue.
(Another definition for no end in sight that I've seen is " Lack of resolution so far".)
I've seen this clue in The Guardian.
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