Likely answer matching 5-2-3-4: "THOUGHTS ON THE" (no), "SOMETHING OF VALUE" (9-2-5), etc.
Do you have any from your grid that you'd like to double-check against this answer?
Crossword compilers often use definitions that require a bit of lateral thinking. Here is why this answer fits the cryptic parameters:
If you’ve found yourself staring at a crossword grid with the clue and the letter count (5, 2, 3, 4) , you are likely looking for a phrase that is as satisfying to say as it is to write in.
: If the puzzle has a "farming" or "industrial" theme, phrases like this are highly likely.
Actually — I recall a puzzle answer: — NUGGETS (7) — no.
But “useful material or knowledge” could be — too long.