The most common and most likely answer to this crossword clue is the 3 plus 4 letter word LIP READ
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More clues leading to the result LIP READ
Buddy explains!
The straight part
We know that "Grasp without hearing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case grasp without hearing = lip read.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 LIP READ mean?
LIP READ verb- To determine what a person is saying by watching how their lips move.