Gratitude from Oscar-winner Tom? (6)

I believe the answer is:

thanks

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

I don't understand the rest of the clue.

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

I've seen this clue in The Independent.

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