The most common and most likely answer to this crossword clue is the 5 plus 4 plus 5 letter word WATCH THIS SPACE
I've seen this crossword clue in The Daily Telegraph
W
A
T
C
H
T
H
I
S
S
P
A
C
E
More clues leading to the result WATCH THIS SPACE
Buddy explains!
The straight part
We know that "Look here/there’s more to come" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case look here/there’s more to come = watch this space.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.