The African-American shows twice the ability! (3)

I believe the answer is:

can

I'm a little stuck... Click here to teach me more about this clue!

'twice the ability' is the definition.
I can't judge whether this definition defines the answer.

'the african-american shows' is the wordplay.
'shows' says the answer is hidden in the clue.
'CAN' can be found hidden inside 'african american'.

Can you help me to learn more?

(Other definitions for can that I've seen before include "has power" , "toilet" , "Preserve fruit" , "Metal container for food" , "Cooler" .)

I've seen this clue in the Evening Standard.

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