The most common and most likely answer to this crossword clue is the 6 letter word ANALOG
A
N
A
L
O
G
More clues leading to the result ANALOG
Buddy explains!

The straight part
We know that "an old way" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case an old way = analog.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 ANALOG mean?
ANALOG noun- Something that bears an analogy to something else
- An organ or structure that is similar in function to one in another kind of organism but is of dissimilar evolutionary origin
- A structural derivative of a parent compound that often differs from it by a single element
- (of a device or system) in which the value of a data item (such as time) is represented by a continuous(ly) variable physical quantity that can be measured (such as the shadow of a sundial)