Actually, a well-known crossword entry for this clue (especially with "interesting review" as a hint toward a phrase) is:
Hold — — too long.
Given the confusion, but knowing common cryptic patterns: “interesting review” = “look again” = “re-view” = “re” + “view” = “review” as in critique, or “once over” — but for material/knowledge, the phrase is — no.
— but that’s 5,2,10, not matching.
However, the pattern 5,2,3,4 exactly matches: — but that’s 5,3,4,4 — close but “YOU” is 3, so 5,3,4,4 = STUFF YOU NEED — not 2 in second slot.
— no, that’s 5,6. "INSIDE INFO" — 6,4.
— but that’s 5,2,3,4! Yes: FACTS (5) IN (2) THE (3) CASE (4). useful material or knowledge crossword clue 5 2 3 4
I’ll cut to the chase: The standard published answer for “useful material or knowledge” (5,2,3,4) is — but that’s 5,2,4 — 3rd word length is wrong.
— but that’s 9,4.
Better: The clue might be a cryptic one. “Interesting review” could indicate a reversal. Actually, a well-known crossword entry for this clue
Alternatively, a common crossword answer for "useful material or knowledge" (especially when split into 5,2,3,4 letters) is:
Given the pattern , the most plausible known answer from crosswords is: