The most common and most likely answer to this crossword clue is the 6 plus 4 letter word BAKING SODA
I've seen this crossword clue in Financial Times
B
A
K
I
N
G
S
O
D
A
More clues leading to the result BAKING SODA
- Agent raising commotion back with graduate at college
- What raises family is covered by “for a start, be a good sport and fuss around!”
- Rising agent of bank said: “Go away”
- Muddle bad, go in and ask for cleaner
- Bad skin? Go for treatment with a soothing compound
- Flexible bag is OK and gets used in the kitchen
- How dosa is made from a culinary ingredient?
- Man like that, awful clothes, a cleaner
- NaHCO 3 an ingredient of Nacho?
- Cooking thus, US barman used an acid salt
Buddy explains!

The straight part
We know that "NaHCO 3/ingredient of Nacho?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case nahco 3/ingredient of nacho? = baking soda.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.