A London orchestra, furthermore! (4)

I believe the answer is:

also

'furthermore' is the definition.
(I've seen this in another clue)

'a london orchestra' is the wordplay.
'london orchestra' becomes 'LSO' (london symphony orchestra).
'a'+'lso'='ALSO'

(Other definitions for also that I've seen before include "What's more" , "Additionally" , "As well, in addition" , "in accompaniment" , "Furthermore" .)

I've seen this clue in the Evening Standard.

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