The most common and most likely answer to this crossword clue is the 2 plus 4 letter word IN TOTO
I
N
T
O
T
O
More clues leading to the result IN TOTO
- Entirely enthused by Toronto's outskirts
- Wholly or partly certain to topple
- Altogether where Dorothy’s dog food ended up
- Hot dog with everything added
- Entirely independent new group getting platinum from Africa
- Altogether Dorothy’s dog food ends up here
- Two or three prepositions, altogether
- Entirely possible that bones from Oz might be found here
- Popular Wizard of Oz role as a whole
- Completely hot dog Dorothy had
Buddy explains!

The straight part
We know that "Entirely" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case entirely = in toto.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.