The most common and most likely answer to this crossword clue is the 11 letter word SIGHTSCREEN
I've seen this crossword clue in The Daily Telegraph
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Buddy explains!
The straight part
We know that "help for the bat" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case help for the bat = sightscreen.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 SIGHTSCREEN mean?
SIGHTSCREEN noun- A large screen, at each end of a cricket field, coloured to provide visual contrast to the cricket ball, to aid the batsman in seeing its movement through the air.