Crossword Genius

Relative area reduced by half? Not sure (7)


I believe the answer is:


'not sure' is the definition.
(unclear can mean uncertain or undecided)

'relative area reduced by half?' is the wordplay.
'relative' becomes 'uncle' (uncle is a kind of relative).
'reduced by half?' indicates taking half.
'area' halved is 'ar'.

(Other definitions for unclear that I've seen before include "Imprecise, hazy" , "Not transparent or free from doubt" , "Not distinct in nuclear way" , "hard to understand" , "Poorly described" .)

I've seen this clue in The Times.
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