The most common and most likely answer to this crossword clue is the 6 letter word FRANCO
I've seen this crossword clue in The Daily Telegraph
F
R
A
N
C
O
More clues leading to the result FRANCO
- Brother non-com and French nationalist general
- Female was firm’s boss in general
- A former head of state
- Country ousting English, having love for dictator
- European leader offering his neighbouring country almost nothing
- Dictator worked in fine company
- . Spanish general started fishing, managed firm
- General staff ultimately administered business
Buddy explains!

The straight part
We know that "European leader" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case european leader = franco.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 FRANCO mean?
FRANCO noun- The currency issued between 1805 and 1808 of Lucca in Tuscany, Italy.