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1a. Tense choir sit nervously here (8,7)
Historic P_e_e_t
22a. English crackers passed round as accompaniment to this? (4) _d__
15a. Works with preservationists producing effects (7)
o_e_a_t
23d. Joint finally lit in bog (5) __t_e
Been stuck all week. TYVMIA

Historic present
Edam

Mitre

Operant (works = opera, NT = National TRust = preservationists)

last one is....mitre.