The most common and most likely answer to this crossword clue is the 2 plus 7 letter word NO COMMENT
N
O
C
O
M
M
E
N
T
More clues leading to the result NO COMMENT
- Unhappily married twice, not once, I’ve nothing to say!
- Refusal to answer memo cannot avoid a disaster
- Ten common outbursts? My lips are sealed
- Ten common moves of which I’ll not speak
- Neutral attitude? It with month gone becomes unrevealing response
- Turned on married men in bed? I couldn’t say
- Confused memo about top half of cowl getting tangled in nun’s extremities, leading to mouth of Trappist saying this?
Buddy explains!

The straight part
We know that "unrevealing response" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unrevealing response = no comment.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.