A further section of orchestra not here (7)
I believe the answer is:
another
'a further' is the definition.
(I've seen this before)
'section of orchestra not here' is the wordplay.
'section of' indicates the answer is hidden within the clue.
'ANOTHER' can be found hidden inside 'orchestra not here'.
(Other definitions for another that I've seen before include "A different one" , "encore?" , "A further (item)" , "Additional, one more" , "A different (thing)" .)