The most common and most likely answer to this crossword clue is the 6 letter word CLENCH
I've seen this crossword clue in The Times
C
L
E
N
C
H
More clues leading to the result CLENCH
Buddy explains!
The straight part
We know that "Grasp" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case grasp = clench.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 CLENCH mean?
CLENCH noun- Tight grip.
- A seal that is applied to formed thin-wall bushings.
- A local chapter of the Church of the SubGenius parody religion.
- To grip or hold fast.
- To close tightly.