A number wearing symbol of Aviator shades (7)

'aviator shades' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Maybe there's an association between them I don't understand?

'a number wearing symbol' is the wordplay.
'number' becomes 'n' (n can represent any number).
'wearing' means one lot of letters goes inside another.
'symbol' becomes 'wings' (I can't justify this - if you can you should give a lot more credence to this answer).
'n' inserted into 'wings' is 'wnings'.
'a'+'wnings'='AWNINGS'

'of' acts as a link.

Can you help me to learn more?