The most common and most likely answer to this crossword clue is the 8 letter word NAPOLEON
I've seen this crossword clue in The Times
N
A
P
O
L
E
O
N
More clues leading to the result NAPOLEON
- Recalled article by North European on military general
- French coin a name for their emperor
- Christmas over, roast flipping pig
- Nuts on plane carrying old emperor
- Emperor, not in Paris, carrying a staff
- Frenchman's refusal to accept a foreigner as emperor
- An east European impressed by no French emperor
- Card game. Solo, maybe
- . Refusal abroad to accept a European emperor
- Old gold coin found in river by boy framed by gran
Buddy explains!

The straight part
We know that "pig" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pig = napoleon.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 NAPOLEON mean?
NAPOLEON noun- A former 40-franc gold coin issued by France.
- A form of solitaire.
- A short period of sleep, especially one during the day.
- A soft or fuzzy surface, generally on fabric or leather.
- The common direction, on some kinds of fabric, of the hairs making up the pile.
- A type of bet in British horse racing, based on the experts' best tips.
- A card game in which players take tricks; properly Napoleon.
- A bid to take five tricks in the card game Napoleon.
- (dialectal, Northern England, Scotland) A cup, bowl.
- The franc germinal: a 20-franc gold coin issued under Napoleon.
- Other subsequent 20-franc coins, notes, or values.
- (usually admiringly derogatory) A person resembling Napoleon Bonaparte, in having come to dominate an area or sphere of activity through ruthlessness or illegality as well as surpassing ability.
- Clipping of Napoleon boot: a form of topboot worn by officers during the Napoleonic Wars.
- Clipping of Napoleon gun: a 12-pounder cannon first used by the Second French Empire.
- A 19th-century five-card trick-taking game simplified from euchre.
- Clipping of Napoleon bigarreau: a variety of the white-fleshed bigarreau cherry; a variety of cherry tree bearing such fruit.
- (originally United States slang) Clipping of Napoleon cake: another name for a millefeuille pastry.
- (alcohol) Clipping of Napoleon brandy: any excellent brandy; a serving of such a brandy.
- (pastries) A multi-layered stacked pastry