Swiftness shown by father, out of delicacy (7)
I believe the answer is:
agility
'swiftness' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for agility that I've seen before include "Gaily it goes with nimble movement" , "Physical ability to move nimbly and quickly" , "Sprightliness" , "Spryness" , "Gracefulness of the quick and nimble" .)