The most common and most likely answer to this crossword clue is the 7 letter word APLENTY
I've seen this crossword clue in The Guardian
A
P
L
E
N
T
Y
More clues leading to the result APLENTY
- Penalty is roughly presented in numbers
- Abundantly rocky planet, last in galaxy
- To spare a net breaking, fold round it
- Penalty, though not fine, a lot
- More than enough to convert penalty
- Penalty shot to spare
- Fruit cored and nasty when discarded in heaps
- Extensively analyse planet Mercury finally
- Planet needing to change yen in abundance
Buddy explains!

The straight part
We know that "to spare" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case to spare = aplenty.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 APLENTY mean?
APLENTY adjective- In a generous or overlarge quantity.
- Enough or more than enough.