A daughter with suitable skills at the outset is flexible (6)
I believe the answer is:
adapts
'is flexible' is the definition.
(to adapt is to be flexible)
'a daughter with suitable skills at the outset' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'with' is a charade indicator (letters next to each other).
'suitable' becomes 'apt' (apt means appropriate or fitting).
'at the outset' indicates taking the first letters (the outset is the beginning).
The first letter of 'skills' is 's'.
'a'+'d'+'apt'+'s'='ADAPTS'
(Other definitions for adapts that I've seen before include "Alters for another use" , "Converts to another use or purpose" , "Changes to suit another purpose" , "Alters to suit new conditions" , "Adjusts to new conditions" .)