The most common and most likely answer to this crossword clue is the 10 letter word WIDESPREAD
I've seen this crossword clue in The Daily Telegraph
W
I
D
E
S
P
R
E
A
D
More clues leading to the result WIDESPREAD
- Liberal feast available to lots of people
- Lax padres sadly found in many places
- Extra marmalade, perhaps, for general
- Extra seconds with last of soup dipped into — it’s common!
- Common to find extra starting price studied
- Extra butter, say, in general
- General‘s vast banquet
- Extensive weeds with rapid dispersing
- Extra small page perused, in general
- Extra lavish meal is customary
Buddy explains!

The straight part
We know that "common" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case common = widespread.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 WIDESPREAD mean?
WIDESPREAD adjective- Affecting a large area (e.g. the entire land or body); broad in extent; widely diffused.