Covering with wood, temperature in damaged roof ain't safe (13)

I believe the answer is:

afforestation

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'covering with wood' is the definition.
I can't judge whether this definition defines the answer.

'temperature in damaged roof ain't safe' is the wordplay.
'temperature' becomes 't' (abbreviation).
'in' means one lot of letters goes inside another.
'damaged' indicates an anagram.
'roof'+'aint'+'safe'='roofaintsafe'
'roofaintsafe' is an anagram of 'afforestaion'.
't' inserted inside 'afforestaion' is 'AFFORESTATION'.

Can you help me to learn more?

(Another definition for afforestation that I've seen is " planting trees".)

I've seen this clue in The Telegraph.

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