20 down
Silly
ass
–
it
follows
direction
repeatedly
(6)
Silly ass – it follows direction repeatedly (6)
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The definition is at the beginning of the clue.
How the clue works
Silly ass is your definition — a foolish person. The wordplay builds the answer by taking a compass direction followed by IT, then doing the same thing again: N (north) plus IT, then W (west) plus IT, giving you N-IT-W-IT.