The most common and most likely answer to this crossword clue is the 7 letter word SPAREST
I've seen this crossword clue in Financial Times
S
P
A
R
E
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T
More clues leading to the result SPAREST
Buddy explains!
The straight part
We know that "Most frugal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most frugal = sparest.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 SPAREST mean?
SPAREST adjective- Scant; not abundant or plentiful.
- Sparing; frugal; parsimonious; not spending much money.
- Being more than what is necessary, or what must be used or reserved; not wanted, or not used; superfluous.
- Held in reserve, to be used in an emergency.
- Lean; lacking flesh; meager; thin; gaunt.
- Very angry; frustrated or distraught.
- Slow.
- To show mercy.
- To keep.
- To give up To deprive oneself of, as by being frugal; to do without; to dispense with; to give up; to part with.