The most common and most likely answer to this crossword clue is the 5 letter word MOVER
I've seen this crossword clue in The Times
M
O
V
E
R
More clues leading to the result MOVER
- Proposer is Shaker’s companion?
- Marriage completed, one changing residence?
- One shifting up after film’s ending
- One advancing with month remaining
- Leader of meeting regarding someone who brings forward proposal
- One who’s made a proposal married again
- Person not keeping still after first of moonshine’s finished
- One to shift a couple of maidens?
- Relocation expert married again
Buddy explains!

The straight part
We know that "One advancing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one advancing = mover.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 MOVER mean?
MOVER noun- Someone who or something that moves.
- A dancer.
- A person employed to help people move their possessions from one residence to another.
- Someone who proposes a motion at a meeting.