Sunday World Cryptic

[tadoran]

4)Expresses requirements for a choir(6) ??????
12a) They may be strung up by the neck(5) ?????
21a) Testing the edge of a razor may mean putting too fine a point on it (4-9) ???? ??l?t????
15d) Moves in an unfinished game on board(6) ?n????
6d) Looking, or just thinking about it (13) ????????a????
2d) It is bound to appeal to travellers(6-7) P????? ??I????
Thanks All

[Lie-in King]

21a Hair-splitting

2d Pocket edition (of a book)

[Mamyalynne]

6 Contemplating

[Mamyalynne]

15 Inches(s)

[Mamyalynne]

12 Beads?

[Mamyalynne]

4 Voices

[jrgrange]

Hi everyone.looking for the last answer in this crossword.
5d his advice may be sought if the pupils are dull.7 letters.
o?u?s?t.many thanks in advance.

[scorpiojo]

Oculist

[vakayu]

oculist

[vakayu]

^^as in the pupils of one's eyes.