Wind round and round, in crack (7)
I believe the answer is:
chinook
'wind round' is the definition.
'chinook' can be an answer for 'wind' (I've seen this before). I am unsure of the 'round' bit.
'round in crack' is the wordplay.
'round' means one lot of letters goes inside another.
'crack' becomes 'chook' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' put into 'chook' is 'CHINOOK'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for chinook that I've seen before include "What blows" , "North American wind, native or language" , "Native American - wind - helicopter" , "hot wind" , "nickname of US State" .)