The most common and most likely answer to this crossword clue is the 5 letter word AMPLE
I've seen this crossword clue in The Times
A
M
P
L
E
More clues leading to the result AMPLE
- Large specimen unopened
- More than enough to taste without needing seconds
- Filling of jam, plenty or enough?
- A politician lied, oddly enough
- Generous bit to try out, not the first
- Large specimen with top cut off
- Fat politician consumed by booze
- Liberal with no previous partner for instance
- Small portion without starter's more than enough
- Large specimen, not small
Buddy explains!

The straight part
We know that "Liberal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case liberal = ample.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 AMPLE mean?
AMPLE adjective- Large; great in size, extent, capacity, or bulk; for example spacious, roomy or widely extended.
- Fully sufficient; abundant; plenty
- Not contracted or brief; not concise; extended; diffusive