The most common and most likely answer to this crossword clue is the 7 letter word CUSTODY
I've seen this crossword clue in The Daily Telegraph
C
U
S
T
O
D
Y
More clues leading to the result CUSTODY
- Keep like custard, it’s said
- Detention sounding saucy?
- Keeping like a sweet sauce, say
- Porridge that’s like a bit of trifle, orally
- Charge for lock-up?
- Porridge resembles milky sauce, they say
- Keeping conservative ones away from American daily
- Scud toy may become subject matter of divorce case, perhaps
- Detention is like the topping on a dessert, you might say!
Buddy explains!

The straight part
We know that "Porridge" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case porridge = custody.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 CUSTODY mean?
CUSTODY noun- The legal right to take care of something or somebody, especially children.
- Temporary possession or care of somebody else's property.
- The state of being imprisoned or detained, usually pending a trial.
- An area under the jurisdiction of a custos within the Order of Friars Minor.