Alfie Special no.6

As the example suggests, the metals to be removed from the fourteen clues printed with a yellow background were the conventional chemical symbols, e.g. Fe for iron, K for potassium etc. Thus, 9A:RE(FE)CTORY, 10A:AM(MO)NIA, 11A:SP(IN)ED, 19A:DI(V)ED, 22a:9(W)EIGHT, 24A:ADVER(TI)SE, 26A:CLAR(IN)ET
1D:SE(CU)RE, 5D:CHA(OS), 11DSA(K)E, 16D:GO(NA)D, 17D:CA(LI)PERS, 21D:RE(CA)NT, 23D:TAN(K).

The answer to 7 Down: Anatto is both the American tree and the dye derived from it, sometimes known as roucou. It is to be found in Chambers and the Shorter Oxford dictionaries.