Crossword Genius

A cup showing degeneration (7)

Ross

I believe the answer is:

atrophy

'degeneration' is the definition.
(thesaurus)

'a cup' is the wordplay.
'cup' becomes 'trophy' (I've seen this before).
'a'+'trophy'='ATROPHY'

'showing' acts as a link.

(Other definitions for atrophy that I've seen before include "shrivel" , "Waste away, wither" , "Decline" , "Waste away - sounds like a sporting award" , "Waste away through under-nourishment or lack of use" .)

I've seen this clue in The Telegraph.
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