Crossword Genius

In which to look sharp (5)

Ross

I believe the answer is:

focus

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This could be a double definition.

'in which' is the first definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'look sharp' is the second definition.
The definition and answer can be both human attributes as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'to' is the link.

Can you help me to learn more?

(Other definitions for focus that I've seen before include "Concentrate - type of group" , "Adjust (camera lens)" , "Centre of concentration" , "Central point" , "Concentrate, zero in" .)

I've seen this clue in the Evening Standard.
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