Crossword Genius

A shrewd six-footer (3)

Ross

I believe the answer is:

fly

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This clue might be a double definition.

'a shrewd' is the first definition.
(fly can mean shrewd or astute)

'six-footer' is the second definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

Can you help me to learn more?

(Other definitions for fly that I've seen before include "Soar; hurry" , "Take wing" , "needs to get away" , "Run away; smart (colloq.)" , "Dipterous insect" .)

I've seen this clue in the Evening Standard.
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