The most common and most likely answer to this crossword clue is the 9 letter word BUTTERING
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Buddy explains!
The straight part
We know that "spreading" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case spreading = buttering.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 BUTTERING mean?
BUTTERING verb- To spread butter on.
- To move one's weight backwards or forwards onto the tips or tails of one's skis or snowboard so only the tip or tail is in contact with the snow.
- To increase (stakes) at every throw of dice, or every game.
- The application of butter to something.