Cryptic crossword clue
Spell out fully the thinking behind old money

The most common and most likely answer to this crossword clue is the 7 letter word EXPOUND

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "Spell out fully the thinking behind" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case spell out fully the thinking behind = expound.
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 EXPOUND mean?

EXPOUND verb
  1. To set out the meaning of; to explain or discuss at length
  2. To make a statement, especially at length.

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