Revolutionary supports a structured naval barrage (9)
I believe the answer is:
avalanche
'barrage' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'revolutionary supports a structured naval' is the wordplay.
'revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
'supports' says to put letters next to each other (bottom letters provide a support for the top ones).
'structured' indicates anagramming the letters.
'naval' with letters rearranged gives 'valan'.
'a'+'valan'='avalan'
'che' put after 'avalan' is 'AVALANCHE'.
Can you help me to learn more?
(Other definitions for avalanche that I've seen before include "Slide of large amounts of snow or stone" , "serious fall" , "great fall" , "Large snow or rock fall" , "Great snowfall" .)