Instruct goose soaring and circling to come down (9)
I believe the answer is:
enlighten
'instruct' is the definition.
(I know that enlighten is a type of instruct)
'goose soaring and circling to come down' is the wordplay.
'goose soaring' becomes 'ene' (I can't explain this - if you can you should believe this answer much more).
'and' becomes 'n' (common abbreviation for 'and').
'circling' means one lot of letters goes inside another (circling can mean going around or containing).
'to come down' becomes 'light' (lighting is a kind of coming down).
'ene'+'n'='enen'
'enen' going around 'light' is 'ENLIGHTEN'.
(Other definitions for enlighten that I've seen before include "free from superstition" , "Give knowledge and understanding to" , "Explain" , "Instruct" , "Illuminate" .)