Cure film of being compassionate (8)

I believe the answer is:

merciful

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'being compassionate' is the definition.
(associated in meaning)

'cure film' is the wordplay.
'cure film' anagrams to 'MERCIFUL'.
Though, I am not sure how the anagram is indicated.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for merciful that I've seen before include "Clement - forbearing" , "Showing pity or leniency" , "showing forbearance" , "Showing forgiveness" , "Kind" .)

I've seen this clue in The Irish Independent.

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