Crossword Genius

Disappoint old and new sports­men at the centre — sorry! (3,4)

Ross

I believe the answer is:

let down

'disappoint' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

(Other definitions for let down that I've seen before include "blow" , "Disappointment < lowered" , "deflating" , "Disappoint, fail to support" , "Failed - deflated" .)

I've seen this clue in The Guardian.
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