Crossword Genius

Old marshal not coming down for long (3)

Ross

I believe the answer is:

yen

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'long' is the definition.
(I know that yen is a type of long)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for yen that I've seen before include "Longing, hankering after" , "Unit of money in Japan" , "Itch, desire" , "Pine" , "Itch, craving" .)

I've seen this clue in The Times.
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