In the clause it was set alight, is alight
- acting as adverb and modifying was set
- an adjective and modifying it; or
- something else entirely that I'm missing.
I'm fairly certain that set alight isn't a phrasal verb so I'm a little stumped.
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It was set alight.
I would understand alight here as an adjective describing it and acting syntactically as a resultative Predicate Complement to the verb set: [something] caused it to be alight.