The most common and most likely answer to this crossword clue is the 9 letter word GOALMOUTH
I've seen this crossword clue in The Daily Telegraph
G
O
A
L
M
O
U
T
H
More clues leading to the result GOALMOUTH
Buddy explains!
The straight part
We know that "Space between posts" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case space between posts = goalmouth.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 GOALMOUTH mean?
GOALMOUTH noun- The area in front of the goal.
- The space between the goalposts through which the ball, puck, etc has to pass in order to score