Warrant 4.1: Solution

B At E S   A M B O S   L A T E
E L L I   C A R P I   A R I A
T A L L   C R U E T   M E E T
A S S A D   K I R   M A A R S
      S E R E N A D E S      
E S S   M A D   T A D   S Ni P
Cl I C K E D   O I L   S T A R
A C R E S   P A C   S A U C E
I K O N   R A F   M A G P I E
R O D   D U N   G E L   A N N
      S A B O T A G E D      
A A R O N   R A M   S O C A S
G L I A   R A C E S   L O B E
A M O K   E M I T S   E D I T
R A T S   Ne A T E R   D E B I

Several of the squares have multiple letters in them, all chemical elements. The numbers for those squares match the element number of those elements. There are three others that match the element numbers, K, O and C. All seven of these are highlighted in the grid above. All of them correspond with one clue, except O which has both a down and across clue, so it gets doubled. This gives you:

At K Ni Cl O O C Ne

which can be rearranged to read

At NiNe OClOCK

Lobby 6 has a huge copy of Medeleev's table of the elements with chemists around it. The chemist AT NINE O'CLOCK is JABIR, which is the answer to the puzzle.