Kind husband has brooded about one coming down on the head at Eton once? (4,3)
I believe the answer is:
silk hat
'one coming down on the head at eton once?' is the definition.
'kind husband has brooded about' is the wordplay.
'kind' becomes 'ilk' (ilk is a kind of kind**).
'husband' becomes 'h'.
'has' says to put letters next to each other.
'brooded' becomes 'sat' (to brood eggs is to sit on them).
'about' means one lot of letters goes inside another.
'ilk'+'h'='ilkh'
'ilkh' placed within 'sat' is 'SILK-HAT'.
(Other definitions for silk hat that I've seen before include "One worn" , "Formal headgear" , "Topper" , "Something for the head" .)