Cancer the lab destroyed, having freedom of action (5,7)

I believe the answer is:

carte blanche

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'freedom of action' is the definition.
'carte blanche' can be an answer for 'freedom' (I've seen this before). I am unsure of the 'of action' bit.

'cancer the lab destroyed' is the wordplay.
'destroyed' indicates anagramming the letters.
'cancer'+'the'+'lab'='cancerthelab'
'cancerthelab' is an anagram of 'CARTE-BLANCHE'.

'having' acts as a link.

Can you help me to learn more?

(Other definitions for carte blanche that I've seen before include "total freedom" , "Complete discretion" , "Complete authority" , "Complete freedom of action" , "Full discretionary power" .)

I've seen this clue in The Guardian.

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