Attributive use of the noun (‘setting spray’, ‘setting plaster’) warrants separate adjectival entry.
Used attributively to describe something that causes or is undergoing the process of becoming fixed, hard, or established (e.g., 'setting compound').
settinggerundium / partizip präsens Used attributively to describe something that is currently descending or being placed, e.g., "the setting sun".
Chiefly British mining usage: to lease ground for mineral extraction.