The most common and most likely answer to this crossword clue is the 6 letter word DONUTS
D
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Buddy explains!
The straight part
We know that "They’re taboo when safeguarding heart in restaurants?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they’re taboo when safeguarding heart in restaurants? = donuts.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 DONUTS mean?
DONUTS noun- A deep-fried piece of dough or batter, commonly made in a toroidal or ellipsoidal shape, and mixed with various sweeteners and flavors, sometimes filled with jelly, custard or cream.
- Anything in the shape of a torus.
- (automobile) A peel-out or skid-mark in the shape of donut; a 360-degree skid.
- A spare tire, smaller and less durable than a full-sized tire, only intended for temporary use.
- A toroidal cushion typically used by hemorrhoid patients.
- An idiot.