The most common and most likely answer to this crossword clue is the 8 letter word THINNEST
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The straight part
We know that "Superlatively poor" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case superlatively poor = thinnest.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does THINNEST mean?
THINNEST adjective- Having little thickness or extent from one surface to its opposite.
- Very narrow in all diameters; having a cross section that is small in all directions.
- Having little body fat or flesh; slim; slender; lean; gaunt.
- Of low viscosity or low specific gravity.
- Scarce; not close, crowded, or numerous; not filling the space.
- Describing a poorly played golf shot where the ball is struck by the bottom part of the club head. See fat, shank, toe.
- Lacking body or volume; small; feeble; not full.
- Slight; small; slender; flimsy; superficial; inadequate; not sufficient for a covering.