Whirlwind caused by a Musk company having a change of heart (7)
I believe the answer is:
twister
'whirlwind' is the definition.
(I know that whirlwind can be written as twister)
'a change of heart' is the wordplay.
'a change' becomes 'twist' (twist is a kind of change).
'of heart' becomes 'er' (I can't justify this - if you can you should believe this answer much more).
'twist'+'er'='TWISTER'
'caused by a musk company having' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for twister that I've seen before include "Crook - tornado" , "Cheat - tornado" , "Dishonest person" , "One-eyed menace" , "Rogue - tornado" .)