Times Cryptic

[creamegg]

9a master is biased bypassing head
a?t?s??

4d one supposedly never free to start releasing article
l???h

18a blow a draught
s?u?

17d section of motorway tunnel originally cutting through nuclear base
4,4
?a?t ?a??

29a throw a wobbly bucket down incurring instant fine 5,4
r?i?? ???n

27d lyricist whose change of name was provisional?
i??

[Neveracrossword]

27 Ira(Gershwin) - IRA

[Neveracrossword]

29 Raise Cain, throw a wobbly.

[Captain2]

17d Fas-t lane

[Mamyalynne]

9 (P)Artisan

[Neveracrossword]

17 Fast Lane, part of motorway (Faslane was the nuclear base, add the T from Tunnel(originally)).

[frugalfred]

29 raise Cain?

[Neveracrossword]

4 Lunch

[Neveracrossword]

18 Slug - it means both.

[creamegg]

thanks x