No 12531, Thursday24 Jan 2019, Vulcan

ACROSS
1   Include one terminal in domestic airport after refurbishment (11) INCORPORATE  {ONE+d...iC+AIRPORT}*
8   Attach piece of metal (4) NAIL [DD]
9   Firm with target to achieve maybe (10) WATERTIGHT*
10 Substance in Time's publication (6) TISSUE {T}{ISSUE}
11 Old woman's shown in/escorted (7) USHERED {US{HER}ED}
13 Actually, it's another kind of linearity (2,7) IN REALITY*
15 Vehicle falls into extremely steep slope (5) SCARP {Stee{CAR}P}
16 Decor altered to include some colour (5) CORAL [T]
18 Power given to local chief (9) PRESIDENT {P}{RESIDENT}
22 Leave dark liquid lying about, it could get your foot (3,4) RAT TRAP {PART}{TAR}<=

23 Chair reportedly hurled (6) THROWN (~throne)
26 Seize, eventually skin this animal (10) COMMANDEER {COMMA}{skiN}{DEER}
27 Mark's excellent round (4) SPOT<=
28 Set for a certain reduction in density (11) RAREFACTION*

DOWN
1   Vulgar Latin, basically ancient, Indo-European (7) ITALIAN {LATIN+An...t+I}*
2   Peddles, say, in small rooms (5) CELLS (~sells)
3   Fighting back to cope with unfair treatment (3,4) RAW DEAL {WAR<=}{DEAL}
4   Word of Plato, a thinker (4) OATH [T]
5   One annoyed with what this clue is not (6) ACROSS {A}{CROSS}
6   Editor taken back in, showed it's proven (9) EVIDENCED {EVI{ED<=}NCED}
7   My, leader of opposition heard rambling (2,4) OH DEAR {Op...n}{HEARD*}
12 Celebrity's essentially new look (5) STARE {STAR}{nEw}
14 Metal ores possibly got this material (9) ELASTOMER*
17 One that gives his/her address (6) ORATOR [CD]
19 Sitar played by one comedian primarily given to sarcasm (7) SATIRIC {SITAR*}{1}{Co...n}
20 Nurse shows up with Harry Brown's baby (7) NEWBORN {EN<=}{BROWN*}
21 Guy about to skip a routine (6) MANNER {MAN}{NEaR}
24 Saint? Somewhat of a boorish individual (5) RISHI [T]
25 Feature of damsel/female's character (4) SELF [T]

GRID