A hanging drapery protecting Henry in fall (9)
I believe the answer is:
avalanche
'fall' is the definition.
(I know that avalanche is a type of fall)
'a hanging drapery protecting henry' is the wordplay.
'hanging drapery' becomes 'valance' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'protecting' is an insertion indicator (inserted letters are held or protected).
'henry' becomes 'H' (symbol for the unit of electrical inductance).
'valance' placed around 'h' is 'valanche'.
'a'+'valanche'='AVALANCHE'
'in' is the link.
Can you help me to learn more?
(Other definitions for avalanche that I've seen before include "Snowslip" , "This dangerous flow from some peaks" , "falling-out in the Highlands?" , "Sudden descent of massed snow etc" , "frightening fall" .)