Somehow pitches tent OK, securing height and length? Things become more complex (3,4,8)
I believe the answer is:
the plot thickens
I'm afraid I can't explain this answer.
Can you help me to learn more?
(Other definitions for the plot thickens that I've seen before include "things get less clear" , "When broader nib is used on graph paper" .)
I've seen this clue in The Guardian.
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