The most common and most likely answer to this crossword clue is the 7 letter word VANDYKE
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Buddy explains!
The straight part
We know that "It may display extremes of virility, essential with trim" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it may display extremes of virility, essential with trim = vandyke.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 VANDYKE mean?
VANDYKE noun- An edge with ornamental triangular points.
- A style of facial hair which has both a mustache and goatee but with all cheek hair shaven.
- A style of dress or collar similar to those in Anthony van Dyck's portrait paintings; a small round cape, the border ornamented with points and indentations.
- To fit or furnish with a vandyke; to form with points or scallops like a vandyke.