The most common and most likely answer to this crossword clue is the 7 letter word GRANOLA
I've seen this crossword clue in The Daily Telegraph
G
R
A
N
O
L
A
More clues leading to the result GRANOLA
- Female relative has nothing with the Continental breakfast cereal
- Cereal for nanny with a Scandinavian name
- Maybe bar elderly relative for vandalising day centres
- Breakfast food: elderly relative has duck, look!
- Ran gaol cruelly as alternative to porridge
- Healthy breakfast has organ playing at Californian venue
- Reverend Green turns on organ, playing ‘Breakfast in America’?
- Argan oil one extracted out from breakfast fare
Buddy explains!

The straight part
We know that "alternative to porridge" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case alternative to porridge = granola.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 GRANOLA mean?
GRANOLA noun- A breakfast and snack food consisting of loose, crispy pellets made of nuts, rolled oats, honey and other natural ingredients.
- (of a person) Eating healthy food, supporting the protection of the environment, and having liberal views.