Crossword Genius

Become more viscous (7)

Ross

I believe the answer is:

thicken

'become more viscous' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for thicken that I've seen before include "Become more viscous" , "get fatter?" , "(Of a plot) become more complicated" , "Make more viscous" , "Clot" .)

I've seen this clue in the Universal and The Times.
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