If there is something hidden, I couldn't find it.
ACROSS
7 Spanish painter is unknown in Indian state (4) GOYA {GO{Y}A}
8 Logic to limit beer (9) RATIONALE {RATION}{ALE}
10 Entertained an inspiration in these times (6) AMUSED {A{MUSE}D}
11 Person without knowledge is coasting about (8) AGNOSTIC*
12 Inventor's candid and primarily likes inventing nutcrackers (8) FRANKLIN {FRANK}{L
14 Middlemen take just one rupee and give fishes (6) TROUTS {T{R}OUTS}
16 Endangered, Joan of Arc was burnt here (2,5) AT STAKE [DD]
18 Ask them to rearrange letters for Ipkiss (3,4) THE MASK*
21 Give the French a name (6) HANDLE {HAND}{LE}
23 Communist upset an international humanitarian organisation's emblem (3,5) RED CROSS {RED} {CROSS}
25 Guilty person melts down and misleads (8) CONFUSES {CON}{FUSES}
27 Insensitive to add a bit of toxin to get an anteater (6) NUMBAT {NUMB}{A}{T
29 Dungeon of Calcutta from where not even light can escape (5,4) BLACK HOLE [DD]
30 Columbus sailed with her hidden message in a crossword (4) NINA [DD]
DOWN
1 Nonsense! British soldier is above decomposition (8) TOMMYROT {TOMMY}{ROT}
2 Cigarettes for school underlings (4) FAGS [DD]
3 Nuptial arrangement of ribald characters (6) BRIDAL*
4 Bits of music heard on road over waterfall (7) STRAINS {ST}{RAINS}
5 Uppermost incision in wood of best quality (3-5) TOP-NOTCH {TOP}-{NOTCH}
6 Seeds that are usually sown wildly in youth (4) OATS [CD]
9 Announcement of law found in a Chinese dictionary (5) EDICT [T]
13 Well known that little Theodore was absent (5) NOTED {NO}{TED}
15 Snails in possession of liquor merchants (5) ORMER [T]
17 Preserve liquor as a collectible item (8) KEEPSAKE {KEEP}{SAKE}
19 Endures blots around America (8) SUSTAINS {S{US}TAINS}
20 English city where sorbitol was processed after removing oxygen (7) BRISTOL S
22 Nuclear device found inside a Bombay duck (1-4) A-BOMB [T]
24 Red came back and captured tavern to get a meal (6) DINNER {D{INN}ER<=}
26 Standard plant (4) FLAG [DD]
28 Little time for king to get fur (4) MINK {MIN}{K}
GRID
