The most common and most likely answer to this crossword clue is the 7 letter word TERRIER
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More clues leading to the result TERRIER
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The straight part
We know that "Volunteer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case volunteer = terrier.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 TERRIER mean?
TERRIER noun- A dog from a group of small, lively breeds, originally bred for the hunting of burrowing prey such as rats, rabbits, foxes, and even otters; this original function is reflected in some of their names (e.g. rat terrier).
- A collection of acknowledgments of the vassals or tenants of a lordship, containing the rents and services they owed to the lord, etc.
- An inventory (book or roll) in which the lands of private persons or corporations are described by their site, boundaries, number of acres, etc.; a terrar.
- An auger or borer.