Delicacy, father, and limberness are required for it (9)
I believe the answer is:
fragility
'delicacy' is the definition.
(synonyms)
'father and limberness are required for it' is the wordplay.
I cannot quite see how this works, but
'father' could be 'fra' and 'fra' is found within the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for fragility that I've seen before include "Delicacy" , "weakness" , "quality of eggshell" , "Breakable quality" , "Brittleness" .)