Crossword Genius

One way you could begin to characterise ‘aggressive’? (4,1)

Ross

I believe the answer is:

type a

''aggressive'?' is the definition.
(a type A personality is aggressive and competitive)

I don't understand the rest of the clue.

(Other definitions for type a that I've seen before include "Strong personality" , "stress-inducing nature" , "full of ambition and energy" , "ambitious sort" , "what online solvers would do at 15" .)

I've seen this clue in The Independent.
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