ACROSS
1 Demands and obtains kiss in ultimately lamentable performances (6) EXACTS {X} in {l...lE}{ACTS}
4 The red flag or The Stars and Stripes Forever? (8) STANDARD [DD]
9 Toiler you picture inputting something thunderously, primarily? (6) TYPIST Acrostic Semi&l;it
10 Celebrated audibly in multiple flights (8) STOREYED (~storyed)
11 Victorian cuisine: scoff a kind of dove, very excited (4,6,4) MOCK TURTLE SOUP {MOCK}{TURTLE}{SO}{UP}
15 Brigade, the unruly kind (3-7) BIG-HEARTED {BRIGADE+THE}*
19 English getting runs? One, for a long stretch (3) ERA {E}{R}{A}
20 Out of Sellotape now, all of a sudden (2,3,4,5) AT ONE FELL SWOOP {OF+SELLOTAPE+NOW}*
24 Alpinist's regrettable lack of control (8) TAIL SPIN*
25 Socialist in Caracas: Trotskyist? (6) CASTRO [T]
26 An absent-minded shopper might be this vacant (8) LISTLESS {LIST LESS}
27 Read third letter aloud depicting Biblical impediment (3,3) RED SEA (~read c)
DOWN
1 Guess teatime's off? (8) ESTIMATE*
2 When computer's overwhelming Everyman's a kind of jelly (5) ASPIC {AS}{P{I}C}
3 Cricket match on TV: fourth of batsmen in experimental gear (4,5) TEST TUBES {TEST}{TUBE}{batSmen}
6 Invaders laying waste to Australian navy: they're expected (5) NORMS NORManS
7 See our way to resort? Don't worry (2,3,4) AS YOU WERE {SEE+OUR+WAY}*
8 Two posters stuck up displaying avant-garde art (4) DADA {AD<=}{AD<=}
12 Music and cakes for guttersnipes (11) RAGAMUFFINS {RAGA}{MUFFINS}
14 Charmers, ones that are often fruity (9) SMOOTHIES [DD]
16 Once again enthral, seeing cabbages pruned and half of fragrant sprigs (2-7) RE-ENSLAVE {gREENS}{LAVEnder}
17 Chart with an old record climbing: it's Spanish (8) PAMPLONA {AN+O+LP}{MAP}<=
21 A plan's arranged, not initially paying through the nose (5) NASAL {A+pLANS}*
22 Swears, finding piece of haggis in porridge earlier (5) OATHS {OAT{Ha...s}S}What's the role of 'EARLIER'?
23 To some extent get along with other people (2,2) ET AL [T]
Reference List
Kiss = X, Very = SO, Excited = UP, English = E, Runs = R, Australian = A, Navy = N, Old = O, Record = LP(Long Play)