The most common and most likely answer to this crossword clue is the 6 letter word PAELLA
I've seen this crossword clue in The Times
P
A
E
L
L
A
More clues leading to the result PAELLA
- Girl putting personal appearance first is a dish
- Bound to return to US city for the Spanish food
- The old man with a girl, a dish
- Valencia’s favourite serving father with his daughter?
- Spanish food bringing father and girl together
- Mater’s mantle round Spain, producing archetypal local dish?
- Old man meeting girl, Spanish dish
- Dish containing rice and capers mainly brought back by the French
- Food plate slyly hidden regularly by Australian
- Losing temperature, spread everything around dish
Buddy explains!

The straight part
We know that "Valencia’s favourite serving" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case valencia’s favourite serving = paella.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 PAELLA mean?
PAELLA noun- A savory Valencian dish made of rice, cooked on a frying pan with vegetables and meat or shellfish.