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help for a first timer please!
29d constituent of petroleum (7) T _ L _ E _ _
38d dispute the truth of (9) C _ A _ L _ N _ E
and
40d clever but false reasoning (9) C _ S _ I _ T _ _

many thanks

Toluene

Challenge

Casuistry

grateful thanks Mamya - never heard of Toluene - even sneaked a look at wikipedia