Across

• 1.

  ISAAC: IS-A-A-C
• 12.

  RADII: RADII ("dar" rev.)
• 13.

  PRIOR: PRIOR (double def.)
• 17.

  SWALLOWTAILS: SWALLOW-TAILS (pun)
• 25.

  REPERCUSSION: REPERCUSSION (anag.)
• 31.

  REMIT: REMIT (rev.)
• 32.

  ONION: ONION (hidden)
• 35.

  POSER: POSER (double def.)

Down

• 2.

  SORT: SORT (hidden rev.)
• 4.

  CORAL: CORAL (homophone)
• 8.

  EDAM: EDAM (anag.)
• 10.

  SITES: SITES (homophone)
• 25.

  ROTOR: ROTOR (hidden)
• 26.

  SCRAP: SCRAP ("arcs" rev. + "p")
• 27.

  SNIP: SNIP(e)
• 29.

  BITE: B(IT)E

Sixes and Sevens

• a.

  RAMOSE: R(AM)OSE
• b.

  BAZAAR: BAZAAR (homophone)
• c.

  ANIMALS: ANIMALS (anag.)
• d.

  RINGLET: RINGLET (hidden)
• e.

  STANCE: ST-ANCE (anag. + "st")
• f.

  ENIGMAS: ENIGMAS (anag.)
• g.

  REPRISE: REP-RISE
• h.

  IMPASSE: I'M-PASSE
• i.

  BLARES: BLARES (anag. + "l")
• j.

  ANEMONE: ANEMONE (hidden rev.)
• k.

  PLACATE: PLACATE (homophone)
• l.

  TONSILS: TONSILS (anag.)
• m.

  PRONTO: PRONTO (anag.)
• n.

  MONSOON: M-ON-SOON
• o.

  SALAMI: SALAMI
• p.

  CREATOR: CREATOR (anag.)
• q.

  MONSTER: MONSTER (anag.)
• r.

  IN-LAWS: IN-LAWS (anag.)
• s.

  SCALPS: SCALPS (double def.)
• t.

  BICKERS: BI(C)KERS
• u.

  MARTINI: MARTIN-I
• v.

  ELEGANT: ELEGANT (anag.)