Player: one is found in orchestral area (7)
I believe the answer is:
pianist
'player' is the definition.
(pianist is a kind of player)
'one is found in orchestral area' is the wordplay.
'one' becomes 'an' (an apple is one apple).
'found in' indicates putting letters inside.
'orchestral area' becomes 'pit' (pit is a kind of area. I am not sure about the 'orchestral' bit.).
'an'+'is'='anis'
'anis' inserted inside 'pit' is 'PIANIST'.
Can you help me to learn more?
(Other definitions for pianist that I've seen before include "key performer" , "One tickling the ivories" , "Ivories tinkler" , "Key expert" , "Keyboard player" .)