Old-fashioned leggings worn by upper-class family (5)
I believe the answer is:
house
'family' is the definition.
(eg a royal house)
'old-fashioned leggings worn by upper-class' is the wordplay.
'old-fashioned leggings' becomes 'hose' (I've seen this in another clue. I am not sure about the 'old-fashioned' bit.).
'worn by' indicates putting letters inside (outside letters are worn by those on the inside).
'upper-class' becomes 'u' (similar in meaning).
'hose' going around 'u' is 'HOUSE'.
Can you help me to learn more?
(Other definitions for house that I've seen before include "Abode" , "Dwelling; dynasty" , "Residence, dwelling" , "Building for dwelling in" , "Dwelling, living quarters (5)" .)