Lies in synthetic coverings (10)

I believe the answer is:

falsehoods

I'm a little stuck... Click here to teach me more about this clue!

'lies' is the definition.
(I've seen this before)

'synthetic coverings' is the wordplay.
'synthetic' becomes 'false' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'coverings' becomes 'hoods' (hood is a kind of covering).
'false'+'hoods'='FALSEHOODS'

'in' acts as a link.

Can you help me to learn more?

(Another definition for falsehoods that I've seen is " Lies".)

I've seen this clue in The Everyman puzzle in The Observer.

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