Winds start off blowing over England and Spain (5)
I believe the answer is:
'winds' is the definition.
(oboe is a kind of wind)
'start off blowing over england and spain' is the wordplay.
'start' indicates taking the first letters.
'and' says to put letters next to each other.
'spain' becomes 's' (this could be a standard abbreviation which I don't know about).
The initial letters of 'off blowing over england' is 'oboe'.
Can you help me to learn more?
(Other definitions for oboes that I've seen before include "Woodwind instruments" , "Wind instruments" , "Reed instruments" , "They're instrumental" , "members of orchestra" .)