The most common and most likely answer to this crossword clue is the 3 plus 1 plus 6 plus 2 letter word LAY A FINGER ON
I've seen this crossword clue in The Times
L
A
Y
A
F
I
N
G
E
R
O
N
More clues leading to the result LAY A FINGER ON
Buddy explains!
The straight part
We know that "touch" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case touch = lay a finger on.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.