The most common and most likely answer to this crossword clue is the 6 letter word EVINCE
E
V
I
N
C
E
More clues leading to the result EVINCE
- Prove uncle Vincent is not all there
- Show pairs of events, including ceilidhs
- Reveal fellow needing no introduction at church
- Electronic fault restricting new display
- Show how Venice developed
- Show girl goes round in a hundred
- Show sinner not quite welcomed by Anglican community
- Show off in Venice
- Incorporated into previous day’s show
- Show electronic cable?
Buddy explains!

The straight part
We know that "express" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case express = evince.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 EVINCE mean?
EVINCE verb- To show or demonstrate clearly; to manifest.