Burning extremity makes one move quickly away (7)
I believe the answer is:
hotfoot
'one move quickly away' is the definition.
I can't tell whether this defines the answer.
'burning extremity' is the wordplay.
'burning' becomes 'hot' (similar in meaning).
'extremity' becomes 'foot' (foot is a kind of extremity).
'hot'+'foot'='HOTFOOT'
'makes' acts as a link.
Can you help me to learn more?
(Other definitions for hotfoot that I've seen before include "Experienced by firewalker" , "With all possible speed" , "flat out" , "In eager haste - with fiery sole?" , "Without the slightest delay" .)