In The Chair

[saladdodger]

Some answers have to be modified before entry ( a synonym of "PASS" removed)
27d With boozer unfinished , opening for nocturnal opportunist theft (6) W?L???
23a Quiet fellow penning a note in style of rambling autobiographer (4) SEA?
28a Prescribed slaughtering of animals that lady collided with in Canada on vacation (4) S??A

[Calibax]

27d Walk-in W(ith) alki(e) N(octurnal)

[Calibax]

28a She[CHIT]a she + hit in C(anad)a

[saladdodger]

Thanks very much Calibax..have you done this puzzle?

[Calibax]

^No, I haven't done it. I'm still looking at your third clue.

[saladdodger]

possibly s(hand)ean ?? ...from tristram shandy

[Calibax]

Yes, that looks good saladdodger