Sad action at the end of a concert that's done by violinist? (7)

I believe the answer is:

downbow

'that's done by violinist?' is the definition.
(type of stroke when playing violin)

'sad action at the end of a concert' is the wordplay.
'sad' becomes 'down' (I've seen this before).
'action at the end of a concert' becomes 'bow' (performers might take a bow after a concert).
'down'+'bow'='DOWNBOW'

(Another definition for downbow that I've seen is " Violin stroke".)

I've seen this clue in The Telegraph.

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