The most common and most likely answer to this crossword clue is the 8 letter word CALENDER
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The straight part
We know that "Press" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case press = calender.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 CALENDER mean?
CALENDER noun- A machine, used for the purpose of giving cloth, paper etc., a smooth, even, and glossy or glazed surface, by cold or hot pressure, or for watering them and giving them a wavy appearance; it consists of two or more cylinders revolving nearly in contact, with the necessary apparatus for moving and regulating.
- One who pursues the business of calendering.
- To press between rollers for the purpose of making smooth and glossy, or wavy, as woolen and silk stuffs, linens, paper etc., as in a calender.
- One of a wandering, mendicant Sufic order of fantastically dressed or painted dervishes, founded in the 13th century by an Arab named Yusuf.