The most common and most likely answer to this crossword clue is the 9 letter word PROVENDER
I've seen this crossword clue in The Daily Telegraph
P
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More clues leading to the result PROVENDER
- Professional salesperson’s alternative spelling for animal feed
- Heading for Portsmouth, rambler will seize last food
- Food bound to be consumed by traveller under pressure
- Food for trader
- One paid US seller for food
- Food‘s tested! Hamburger’s the …
- Dog under piano consumes remnant of food
- Supplies spin round seller in US
- Stock of food established revolutionary communist
- Demonstrated socialist revolutionary food for livestock
Buddy explains!

The straight part
We know that "food for livestock" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case food for livestock = provender.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 PROVENDER mean?
PROVENDER noun- Food, especially for livestock.
- To feed.