The most common and most likely answer to this crossword clue is the 3 plus 3 letter word LAY OUT
I've seen this crossword clue in The Daily Telegraph
L
A
Y
O
U
T
More clues leading to the result LAY OUT
Buddy explains!
The straight part
We know that "to spend" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case to spend = lay out.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.
Crossword Answer definitions
LAY OUT noun- A structured arrangement of items within certain limits.
- A plan for such arrangement.
- The act of laying out something.
- The process of arranging editorial content, advertising, graphics and other information to fit within certain constraints.
- A map or a drawing of a construction site showing the position of roads, buildings or other constructions.
- A specification of an integrated circuit showing the position of the physical components that will implement the schematic in silicon.