Enjoyed this one also, even though I am stuck for a few annos and have a couple of question marks. Liked 22D.
ACROSS
6 & 27 Ac. There is also history in the making of dentifrice in Paris (5,5) TOOTH PASTE {TOO}{TH {PAST}E}
7 Like modern subject from old kingdom (8) ASSYRIAN {AS}{SYRIAN}
10 Two parts of circle briefly join at a place in Greece (7) ARCADIA {ARC}{A}{DIA}
11 Cloth, paper and zebra skin (7) ORGANZA {ORGAN}{Z
12 Pitman against a Greek Goddess (7) MINERVA {MINER}{V}{A}
13 Girl's disheartened, still too young to shine (7)
14 In knowledge, payment on date amounts to nothing (7,4) CHICKEN FEED {CHIC}{KEN} {FEE}{D}
19 Royal code for a top banana (7) KINGPIN {KING}{PIN}
21 The Italian chronicle about new dish (7) LASAGNA {LA}{SAG{N}A}
23 Desperate – the country almost got it back (7) FRANTIC {FRAN{TI<=}C
25 Winner, a bit offensive (7) NOISOME {NO 1}{SOME}
26 Herb's especially husked and ground (8) ALLSPICE
27 See 6 Ac. (5)
DOWN
1 One by one going through volumes – fiery and given to eruptions (8) VOLCANIC {AN} and {1} in {VOL} and {CC}
2 Drink bar comes up under a veil (6) CHADOR {CHA}{DOR<=}
3 Crazy family may bring one down (6,4) BANANA SKIN {BANANA S}{KIN}
4 European city in the middle of industrial action (4) OSLO {
5 Bird, two girls and a model (6) GANNET {G}{ANNE}{T}
6 It's allowed to get into public transport with a physical injury (6) TRAUMA {TRA{U}M}{A}
8 Type of music makes a boy get into a fit (7) RAGTIME {RAG{TIM}E}
9 Browbeat two females in the family (5)
13 Arms stay a bit longer in his arms (10) GUNSLINGER {GUNS}{LINGER} Semi&lit
15 Originally computerised – coder removed by force (7) IMPETUS
16 Cramped quarters for those out of favour (8) DOGHOUSE [C&DD]
17 Canoe or craft, forces leave and trainees join (5) SKIFF SKI(-ll+ff) But trainees are leaving and forces are joining here!
18 Play a note for it to reproduce, perhaps (6) GAMETE {GAME}{TE}
20 Peer into the city, almost (6) NEARLY {N{EARL}Y}
22 Philby's cover as a mole, wasn't enough (6) SKIMPY {S{KIM}PY} Nice one
24 One in jail for killing his brother (4) CAIN {CA{1}N} &lit