The most common and most likely answer to this crossword clue is the 10 letter word COMMODIOUS
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More clues leading to the result COMMODIOUS
Buddy explains!

The straight part
We know that "holding plenty" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case holding plenty = commodious.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 COMMODIOUS mean?
COMMODIOUS adjective- Advantageous; profitable.
- Comfortable, free from hardship.
- Spacious and convenient; roomy and comfortable.
- Convenient, useful; serviceable.