Perhaps queen's family tree displays this dependent? (6)
I believe the answer is:
catkin
'tree displays this dependent?' is the definition.
(feature which hangs or depends from certain trees)
'perhaps queen's family' is the wordplay.
I cannot quite understand how this works, but
'family' could be 'kin' ('kin' can be a synonym of 'family') and 'kin' is present in the answer.
'queen' could be 'cat' (a queen is a female cat) and 'cat' is found within the answer.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
(Other definitions for catkin that I've seen before include "Willow or hazel tuft" , "Flowering spike of willow, hazel, etc" , "Flower of hazel, birch etc" , "Kit can (anag.)" , "Flowering shoot of willow etc" .)