FoxLee2 is mistaken about the 'doubled up' referring to both ART and TRA.
toalisi has introduced an extra close-parenthesis symbol to the clue' and also capitalised a lower-case 'd' at the start of doubled. The clue should read:
51 doubled up after first eleven gets a yellow (10)
51 doubled = 102
after E --> E102 = tartrazine (a yellow food dye)