A crypt

Great meal: one penny only! (5)

Direct = great

Testing its legality...

OK, I'll bite. How about ample?

meal + P (one penny)
I would guess, if this was the answer, that it would not be legal since there's not an anag. ind. So, it's probably not the answer.

Nope.
Hint: a p(penny) is removed from a 6letter word,
leaving the 5letter word solution.

super (supper - p)

I have no idea if it's legal or not!

I think that's legal, at least by UK standards!

One cannot confuse Denisian logic with cryptic legality.

That said, it's an unusual and cute cryptic clue and most likely legal. I don't think it's an &lit.

Here's one for Denisian logic which I saw recently (one penny only):

Military HQ in which sides' meetings are invariably obtuse (8)

Pentagon - v. clever

Nothing like hijacking a thread: well, the topic heading is "a crypt" after all!

Here's another one penny only offering specially for many/most boomers:

Person in last quarter of life could be this (9) - anagram

pensioner

Illegal bar gets PG rating
Answer: blind p(i)g !