The most common and most likely answer to this crossword clue is the 8 letter word RACEMOSE
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Buddy explains!
The straight part
We know that "/like a bunch of grapes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case /like a bunch of grapes = racemose.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 RACEMOSE mean?
RACEMOSE adjective- Having flowers arranged along a single central axis, as in a raceme, spike, or catkin.
- (of a disease) expressing such a pattern