Alert as comedian struck (4,2)

I believe the answer is:

with it

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'alert as comedian struck' is the definition.
I can't tell whether this defines the answer.

'comedian struck' is the wordplay.
'comedian' becomes 'wit' (a witty person).
'struck' becomes 'hit' (I've seen this in another clue).
'wit'+'hit'='WITH-IT'

Can you help me to learn more?

(Other definitions for with it that I've seen before include "Intelligently aware; trendy" , "Fashion conscious; alert and aware" , "Fashionable" , "cool" , "as well?" .)

I've seen this clue in The Independent.

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