Hardened substance produced by tree, brought over to make thick mixtures (6)

I believe the answer is:

pastes

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'thick mixtures' is the definition.
'pastes' can be an answer for 'mixtures' (paste is a kind of mixture). I'm not certain of the 'thick' bit.

'hardened substance produced by tree brought over' is the wordplay.
'hardened' becomes 'set' (synonyms).
'substance' becomes 'S' (S is an example).
'produced by tree' becomes 'ap' (I am not sure about this - if you are sure you should believe this answer much more).
'brought over' says the letters should be written backwards.
'set'+'s'+'ap'='setsap'
'setsap' in reverse letter order is 'PASTES'.

'to make' acts as a link.

Can you help me to learn more?

(Another definition for pastes that I've seen is " Sticky stuff, in spates".)

I've seen this clue in The Irish Times.

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