Soldier ready to drop duke disembowelled in march (6)
I believe the answer is:
parade
'march' is the definition.
(parading is a kind of marching)
'soldier ready to drop duke disembowelled' is the wordplay.
'soldier ready to drop' becomes 'para' (short for paratrooper).
'disembowelled' means to remove the middle letters.
'duke' with its centre taken out is 'de'.
'para'+'de'='PARADE'
'in' is the link.
(Other definitions for parade that I've seen before include "Public procession or ceremonial march" , "March-past of troops etc." , "exhibition" , "Carnival" , "Flaunt; ceremonial march" .)