The most common and most likely answer to this crossword clue is the 4 plus 6 letter word ANNO DOMINI
A
N
N
O
D
O
M
I
N
I
More clues leading to the result ANNO DOMINI
- In one second, Italian lady reverses old age
- An acknowledgement old car is showing age
- Fully content to fade in advancing old age
- Girl with old party skirt’s accompaniment for date?
- Herculean? No; do minimum accepted in our time
- Having nap in an old car shows advancing years
- Nowadays, a new number to perform: ‘Teeny-Weeny’
- Latin period
- These days, initially, this could be commercial
- Surfing on domain name, one that’s of its time now
Buddy explains!

The straight part
We know that "Nowadays" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case nowadays = anno domini.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.