Further a London orchestra (4)

I believe the answer is:

also

'further' 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 "Furthermore" , "admitted to Royal Society > too" , "Plus" , "into the bargain" , "in accompaniment" .)

I've seen this clue in The Sun and The Times.

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