Playing long, Rhenish instrument (7,4)

I believe the answer is:

english horn

'instrument' is the definition.
(English horn is an example)

'playing long rhenish' is the wordplay.
'playing' indicates an anagram.
'long'+'rhenish'='longrhenish'
'longrhenish' with letters rearranged gives 'ENGLISH HORN'.

(Another definition for english horn that I've seen is " Cor anglais".)

I've seen this clue in The Independent.

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