What does the cryptic crossword clue "Some paper, off-white, with no heading (4)" mean?

The definition is "Some". The wordplay uses a deletion. REAM (deletion) = REAM; definition: "Some paper," The answer is REAM.

Some paper, off-white, with no heading (4)

Guardian Cryptic #29023 | 24 Across | 2023-03-21 flower