The most common and most likely answer to this crossword clue is the 8 letter word FOOTHOLD
I've seen this crossword clue in Financial Times
F
O
O
T
H
O
L
D
Buddy explains!
The straight part
We know that "Grip" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case grip = foothold.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 FOOTHOLD mean?
FOOTHOLD noun- A solid grip with the feet.
- (by extension) A secure position from which it is difficult to be dislodged.
- Airhead, beachhead, bridgehead, lodgement.