Case file LinkedIn Crossclimb #807: 4-letter ladder, 5 middle exhibits, combo prompt "A compound word for something that supports a streetlight.". Endpoints: LAMP (top) and POST (bottom).
Middle phase answers: "Slightly wet" = DAMP; "Notre ___ (Paris attraction)" = DAME; "Part of an arena that may be retractable" = DOME; "Recommended amount of a medication" = DOSE; "Prepare to be in a photo" = POSE.
Ordering phase: the valid middle chain is DAMP → DAME → DOME → DOSE → POSE. This permutation is the only valid one-letter chain for these answers.
Evidence link: LAMP → DAMP. L→D at the first letter (LAMP → DAMP).
Evidence link: DAMP → DAME. P→E at the fourth letter (DAMP → DAME).
Evidence link: DAME → DOME. A→O at the second letter (DAME → DOME).
Evidence link: DOME → DOSE. M→S at the third letter (DOME → DOSE).
Evidence link: DOSE → POSE. D→P at the first letter (DOSE → POSE).
Evidence link: POSE → POST. E→T at the fourth letter (POSE → POST).
Verdict: LAMP → DAMP → DAME → DOME → DOSE → POSE → POST satisfies every one-letter constraint. The combo clue "A compound word for something that supports a streetlight." describes both end words together — "LAMP" and "POST" each differ by one letter from their adjacent middle rungs and satisfy the shared top+bottom prompt.