Twice give a quiet admonition — it's confidential (4-4)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

self-explanatory, I think 2 ASCENT : A SCENT [trail] 3 CONCERTO : CO[mpany] + anagram [puts out] of CORNET – another satisfying surface 4 STADIA : ST[reet] [way] + reversal [to mount] of AIDA [Verdi opera] 5 CHAPEL : double definition, with further play on the double meanings of ‘press’ and ‘oratory’ – a clever clue 7 RUNNER : double definition 8 PAPERWEIGHT : cryptic definition: I really liked this typical Rufus nautical reference! 14 DENTURES : cryptic definition 15 EXORCISM : and another 16 SPRUNG : double definition – but aren’t the two very close? 17 ABDUCT : AB [sailor] + DUCT [tube] 19 RULING : double definition 20 EMBARK : M [a thousand] in [accepted by] E BARK [bay – as hounds do]: this one made me smile. [I don’t think I’d come across ’embark’ as a transitive verb before; Collins doesn’t have it but Chambers does – as the first meaning, in fact.]