Make a mosaic (10)

I think it could be either:

Which length description are you looking for?:

9 10*

(Other definitions for tessellate that I've seen before include "Form a mosaic - sell estate (anag)" , "perfectly fit to fill a space" , "Decorate with mosaics" , "Create mosaic" , "make a patterned floor?" .)

I've seen this clue in the Thinks.com.

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