Son runs off - and runs off quickly! (7)
I believe the answer is:
sprints
'runs off quickly' is the definition.
I can't judge whether this defines the answer.
'son runs off' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'runs off' becomes 'prints' (I've seen this in another clue).
's'+'prints'='SPRINTS'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for sprints that I've seen before include "Dashes" , "Darts" , "careers" .)