The most common and most likely answer to this crossword clue is the 5 letter word PRIMO
P
R
I
M
O
More clues leading to the result PRIMO
- Key player in commercial having change of heart
- Initially rather proper, before love
- First love, over-demure to begin with
- First formal ball
- Elevated notes may be associated with such old-maidish love
- No amateur, this person’s bound to get leading role
- Formal start to overture — first part in piece
- Electoral system, one that’s second best
- First-rate Victorian operator
Buddy explains!

The straight part
We know that "Initially" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case initially = primo.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 PRIMO mean?
PRIMO noun- The principal part of a duet.
- Best; first-class.