Bagel?

Ner ner ne ner ner! I got there first

That's right - both of you, but the_great_she_elephant just pipped twyngwyn.

 

Easy enough - a bagel would be great for lunch, but not when playing on the court as it means a score of 0 in a set (for those who don't follow tennis).

 

The second clue - sack the Spanish - sack = bag and a Spanish word for the is el 

 

Over to you she_elephant for a clue to exercise the brain.

On the demolished side of the promenade a brutal assassination occurred.

3 words,  4, 2, 5 letters.

No.  Writing brutal with a capital B might give you another clue.

Another clue: demolished can mean deconstructed.

Ides of March