Marina may welcome these revolutionary extremists from steadfast, heroic army (6)
I believe the answer is:
yachts
'extremists from steadfast heroic army' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for yachts that I've seen before include "Pleasure crafts" , "Sailing vessels" , "Sand or sea vessels" , "Pleasue boats" , "Vessels propelled by sail or power" .)