The most common and most likely answer to this crossword clue is the 10 letter word TESSELLATE
I've seen this crossword clue in Independent
T
E
S
S
E
L
L
A
T
E
More clues leading to the result TESSELLATE
- Cover with mosaic put up to promote Greek goddess
- Others regularly dispose of a hollow tile to fit together without gaps
- Naughtily steal steel to make a patterned floor?
- Pave estate and sell up
- Set off to market before teabreak to get tile
- Returned a lower amount recently after a note to create a mosaic
- All settees, when rearranged, fit together
- Create Escher-style image using only teals
Buddy explains!

The straight part
We know that "make a patterned floor?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case make a patterned floor? = tessellate.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TESSELLATE mean?
TESSELLATE verb- To cover with tiles or stones, as a mosaic; to tile.
- Of a two-dimensional shape, such that multiple copies of itself placed edge to edge cover an area leaving no space between the shapes.
- To completely fill (an area) when multiple copies of one or more two-dimensional shapes are placed edge to edge.