Insincerity of heartless state? (10)
I believe the answer is:
hollowness
This clue might be a double definition.
'insincerity' is the first definition.
(thesaurus)
'heartless state?' is the second definition.
'hollowness' can be an answer for 'state?' (hollowness is a kind of state). I am not certain of the 'heartless' bit.
'of' acts as a link.
Can you help me to learn more?
I've seen this clue in The Guardian.
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