Appalling wind finally is blowing (10)

I believe the answer is:

disgusting

I'm a little stuck... Click here to teach me more about this clue!

'appalling' is the definition.

'wind finally is blowing' is the wordplay.
'finally' indicates one should take the final letters.
'blowing' becomes 'gusting' (I can't justify this - if you can you should believe this answer much more).
The final letter of 'wind' is 'd'.
'd'+'is'+'gusting'='DISGUSTING'

Can you help me to learn more?

(Other definitions for disgusting that I've seen before include "Arousing revulsion" , "Nauseating" , "Revolting" .)

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app