The "L” in a BLT sandwich (7)

I believe the answer is:

lettuce

(Other definitions for lettuce that I've seen before include "Leaves eaten in salads" , "Plant with broad crisp leaves used in salads" , "eg Webbs wonder" , "Salad leaf" , "Green-leaved plant good in salads" .)

I've seen this clue in The Times.

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