The most common and most likely answer to this crossword clue is the 8 letter word STAMPING
I've seen this crossword clue in The Daily Telegraph
S
T
A
M
P
I
N
G
More clues leading to the result STAMPING
Buddy explains!

The straight part
We know that "Identifying" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case identifying = stamping.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 STAMPING mean?
STAMPING verb- To step quickly and heavily, once or repeatedly.
- To move (the foot or feet) quickly and heavily, once or repeatedly.
- To strike, beat, or press forcibly with the bottom of the foot, or by thrusting the foot downward.
- To mark by pressing quickly and heavily.
- To give an official marking to, generally by impressing or imprinting a design or symbol.
- To apply postage stamps to.
- To mark; to impress.
- The sound or action of one who stamps.
- A method of manufacturing using dies and extreme pressure.
- A part made by such a method.