Crossword Genius

Looked displeased when let down (7)

Ross

I believe the answer is:

lowered

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'down' is the definition.
(similar in meaning)

I cannot understand how the remainder of the clue works.

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(Other definitions for lowered that I've seen before include "Moved downwards" , "Let down gently" , "Brought down" , "Moved something down" , "looked sullen" .)

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