30 across
Stay
away
from
far
off
fortress
(4,2,1,8)
Stay away from far off fortress (4,2,1,8)
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The whole clue is the definition (& lit or double definition).
How the clue works
This is a double definition. Stay away from means to keep at a distance from something, while far off fortress gives us KEEP (a fortress or castle keep) AT A DISTANCE (far off). Both definitions lead neatly to KEEP AT A DISTANCE.