Fluid used to correct bad pinking? (4,3)

I believe the answer is:

pink gin

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

'fluid used to correct' is the definition.
I can't tell whether this defines the answer.

'bad pinking?' is the wordplay.
'bad' is an anagram indicator.
'pinking' anagrammed gives 'PINK GIN'.

Can you help me to learn more?

(Other definitions for pink gin that I've seen before include "Alcoholic drink" , "Drink with 9" , "Geneva and bitters" , "Angostura-flavoured drink" , "Kingpin (anag.)" .)

I've seen this clue in the Evening Standard.

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