The Sunday Crossword No 3000, Sunday 17 Jun 2018

ACROSS
1   Stop in country's southernmost county (4) CORK [DD]
3   Rejection of force after brief encounter (5-3) BRUSH-OFF {BRUSH}{OF}{F}
10 Point in difficult situation with leaders of army keen for short holiday (9) MINIBREAK {MI{NIB}RE}{Army}{Keen}
11 Plug I put in near lowest point (5) NADIR {N{AD}{I}R}
12 Condemn popular article about beasts (7) ANIMALS {SLAM}{IN}{A}<=
13 Everything in exhibition is superficial (7) SHALLOW {SH{ALL}OW}
15 Gossip left doctor in peril after examination (13) SCANDALMONGER {DA{L}{MO}NGER} after {SCAN}
18 Pointed shoes in shocking pink were slick (6-7) WINKLE-PICKERS*

By Karnstein - Own work, CC BY-SA 3.0, Link

20 Endless odd elements of theory presented in revolutionary way (7) ETERNAL {ThEoRy} in {LANE<=}
22 River bank in very large city in France (7) ORLEANS {O{R}{LEAN}S}
23 Opening clue, not hard, otherwise taken back (5) INTRO {hINT}{OR<=}
25 Key? It's in steel as ordered (9) ESSENTIAL*
26 Leave poems bearing name with singular merit (8) GOODNESS {GO}{OD{N}ES}{S}
27 Spy and spymaster appear (4) SEEM {SEE}{M}

DOWN
1   Oppose heartless mob, breaking cover (6) COMBAT {CO{MoB}AT}
2   Conversion of sinner, a case for rebirth (11) RENAISSANCE*
4   Dissolute men in scrapes (5) RAKES [DD]
5   Offence? Opening old wine, not having one cocktail (9,5) SINGAPORE SLING {SIN}{GAP}{O}{REiSLING}

By Nesnad - Own work, CC BY 4.0, Link

6   Casual eccentric (3) ODD [DD]
7   Loudly working to secure prize, endlessly alert (8) FOREWARN {F}{O{REWARd}N}
8   Amendment of a bill can harm no president (7,7) ABRAHAM LINCOLN*
9   Medium with psychic awareness about evil used to be confused (6,2) MESSED UP {M}{ES{USED*}P}
14 Law-making stage that is interrupted by small, important upset (11) LEGISLATIVE {LEG}{I{S}{VITAL<=}E}
16 Note angry energy in sport (8) LACROSSE {LA}{CROSS}{E}

By dcJohn - keep away on flickr, CC BY 2.0, Link

17 Extensive lamentation after end of bliss (8) SWEEPING {b..sS}{WEEPING}
19 Place of refuge in fantasy, luminous (6) ASYLUM [T]
21 Vegetables, smooth, first to last (5) LEEKS (-s)LEEK(+s)S
24 Temperature? Zero, more than once as well (3) TOO {T}{O}{O}

GRID