The most common and most likely answer to this crossword clue is the 10 letter word POCKETBOOK
I've seen this crossword clue in The Times
P
O
C
K
E
T
B
O
O
K
Buddy explains!
The straight part
We know that "wallet" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wallet = pocketbook.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 POCKETBOOK mean?
POCKETBOOK noun- A woman's purse.
- One's personal budget or economic capacity - the amount one can afford.
- A small book, particularly a paperback or notebook able to fit into a pocket.