Son moved slowly and wrote hurriedly (8)
I believe the answer is:
scrawled
'slowly and wrote hurriedly' is the definition.
I can't judge whether this definition defines the answer.
'son moved' is the wordplay.
'son' becomes 'scraw' (I can't justify this - if you can you should give a lot more credence to this answer).
'moved' becomes 'led' (leading is a kind of moving).
'scraw'+'led'='SCRAWLED'
Can you help me to learn more?
(Other definitions for scrawled that I've seen before include "Wrote carelessly with red claws" , "Wrote carelessly in bad handwriting" .)