Finally, gridlock to diminish: will changes in complexion come from this? (4)

I believe the answer is:

kohl

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'changes in complexion come from this?' is the definition.
The definition suggests a singular noun which matches the answer.

'finally gridlock to diminish will' is the wordplay.
'finally' indicates one should take the final letters.
The final letters of 'gridlock to diminish will' are 'KOHL'.

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(Other definitions for kohl that I've seen before include "Former German Chancellor" , "Black powder for eyes" , "Helmut --, German statesman" , "Black eye-liner; ex-German Chancellor" , "'Cosmetic preparation, to outline eyes in black (4)'" .)

I've seen this clue in The Guardian.

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