A word of gratitude to a film star (6)

I believe the answer is:

thanks

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'a word of gratitude' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for thanks that I've seen before include "I appreciate that" , "Brief expression of appreciation" , "Word of gratitude" , "Much obliged!" , "Cheers" .)

I've seen this clue in the Evening Standard.

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