Obsession concealed by uncouth ingénue (5)

I believe the answer is:

thing

'obsession' is the definition.
(as in 'having a thing' for someone or something)

'concealed by uncouth ingenue' is the wordplay.
'concealed by' indicates a hidden word.
'THING' is hidden within 'uncouth ingenue'.

(Other definitions for thing that I've seen before include "Unspecified object" , "Inanimate object" , "Obsession" , "Object; gadget" , "Article" .)

I've seen this clue in The Times.

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