So, hard hearted, you quickly gain a high position (4)
I believe the answer is:
'you quickly gain a high position' is the definition.
I can't judge whether this definition defines the answer.
'so hard hearted' is the wordplay.
'hearted' says to take the centre.
The central letters of 'hard' are 'ar'.
Can you help me to learn more?
(Other definitions for soar that I've seen before include "'Fly, glide (4)'" , "take to the air" , "Rise to a great height" , "Move quickly upward" , "Rise effortlessly" .)