Extortionists film a fiancé's secrets (5)

I believe the answer is:

mafia

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'extortionists film a fiance's secrets' is the definition.
I can't tell whether this defines the answer.

'extortionists film a fiance's secrets' is the wordplay.
'MAFIA' is hidden in amongst the letters.
But, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for mafia that I've seen before include "Sicilian criminals" , "organised criminals" , "International crime organisation originating in Sicily" , "Criminal society" , "connection claimed to 23 [JFK]" .)

I've seen this clue in the Sydney Morning Herald.

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