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Eager for trailers in dark movie theatre again? (4)

Ross

I believe the answer is:

keen

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

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for keen that I've seen before include "Diligent" , "Razor-edged" , "devoted" , "Enthusiastic or sharp" , "mourn for the departed" .)

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