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Engineer
used
filler
for
heraldic
design
(5-2-3)
Engineer used filler for heraldic design (5-2-3)
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The definition is at the end of the clue.
How the clue works
Right, so heraldic design is what we're after — that's your definition, pointing to the fleur-de-lis emblem. "Engineer" is the anagram signal, telling you to shuffle the letters of "used filler" about, and lo and behold they rearrange neatly into FLEUR-DE-LIS.