The most common and most likely answer to this crossword clue is the 7 letter word VIRGINS
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More clues leading to the result VIRGINS
Buddy explains!

The straight part
We know that "Maids" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case maids = virgins.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 VIRGINS mean?
VIRGINS noun- A person who has never had sexual intercourse, or sometimes, one who has never engaged in any sexual activity at all.
- (early Christian Church) a woman noted for religious piety who has never been married.
- One who has never used or experienced a specified thing.
- Any of several species of gossamer-winged butterflies of the family Lycaenidae.
- A female insect producing eggs from which young are hatched, though there has been no fecundation by a male; a parthenogenetic insect.