What does the cryptic crossword clue "Thin volume agreed, to a certain extent (6)" mean?

The definition is "Thin". The wordplay uses a hidden word. Hidden in "thin voluME AGREed, to a certain extent" The answer is MEAGRE.

Thin volume agreed, to a certain extent (6)

Guardian Cryptic #29507 | 22 Across | 2024-10-07 flower