The most common and most likely answer to this crossword clue is the 9 letter word SUBSTANCE
I've seen this crossword clue in The Daily Telegraph
S
U
B
S
T
A
N
C
E
More clues leading to the result SUBSTANCE
- Replacement policy and stuff
- Matter of position on warship
- Reserve player’s attitude when facing reality
- Reserve position on illegal drug
- More footballers flog extremely choice property
- Bendy buses can’t matter
- Player on bench has point of view that’s material
- Reserve position in matter
- Advance policy for prosperity
- Reserve opinion for matter
Buddy explains!

The straight part
We know that "matter" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case matter = substance.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 SUBSTANCE mean?
SUBSTANCE noun- Physical matter; material.
- The essential part of anything; the most vital part.
- Substantiality; solidity; firmness.
- Material possessions; estate; property; resources.
- A form of matter that has constant chemical composition and characteristic properties.
- Drugs (illegal narcotics)
- Hypostasis.
- To give substance to; to make real or substantial.