Crossword Genius

Emerald isn't terribly aerodynamic (11)

Ross

I believe the answer is:

streamlined

'aerodynamic' is the definition.
(I know that aerodynamic can be written as streamlined)

'emerald isn't terribly' is the wordplay.
'terribly' indicates anagramming the letters.
'emerald'+'isnt'='emeraldisnt'
'emeraldisnt' is an anagram of 'STREAMLINED'.

(Other definitions for streamlined that I've seen before include "Shaped for speed" , "made more efficient" , "Designed for smooth flow" , "Designed to reduce wind resistance" , "Of sleek appearance" .)

I've seen this clue in The Mirror.
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