Emma in films, however acting to entertain politicians (8)

I believe the answer is:

thompson

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'emma' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's a link between them I don't understand?

'films however acting to entertain politicians' is the wordplay.
'films however' becomes 'tho' (I am not sure about this - if you are sure you should believe this answer much more).
'acting' becomes 'on' (I've seen this in other clues).
'to entertain' is an insertion indicator.
'politicians' becomes 'MPs' (Members of Parliament).
'tho'+'on'='thoon'
'thoon' going around 'mps' is 'THOMPSON'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for thompson that I've seen before include "See 7" , "GUN" .)

I've seen this clue in The Times.

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