Crossword Genius

Curiously evenly folded clays (5)

Ross

I believe the answer is:

oddly

'curiously' is the definition.
('oddly' can be a synonym of 'curiously')

'evenly folded clays' is the wordplay.
'evenly' means one should take alternating letters (even-numbered letters only).
'folded'+'clays'='foldedclays'
The alternate letters of 'foldedclays' are 'ODDLY'.

(Other definitions for oddly that I've seen before include "not in the usual way" , "Unusually" , "Strangely, curiously" , "in a curious way" , "Weirdly" .)

I've seen this clue in The Telegraph.
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