The most common and most likely answer to this crossword clue is the 5 letter word SENOR
S
E
N
O
R
More clues leading to the result SENOR
- Spanish chap, person once nursing certain soldiers
- Fellow in Madrid taking top off upset ugly old ladies
- What’s consumed by this enormous foreign gentleman
- I will be rejected by older gent abroad
- OAP losing one address on the Costa del Sol
- Pensioner loses one Spanish title
- Spaniard returning through Santander, one supposed
- Sister snapped up one foreign address
- Elder denied one European title
- Man from Madrid, older, I dropped off
Buddy explains!

The straight part
We know that "address on the Costa del Sol" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case address on the costa del sol = senor.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 SENOR mean?
SENOR noun- A Spanish term of address equivalent to sir or Mr., used alone or capitalized and prefixed to the name of a married or an older man.