The most common and most likely answer to this crossword clue is the 7 letter word LAGGARD
I've seen this crossword clue in The Guardian
L
A
G
G
A
R
D
More clues leading to the result LAGGARD
- One who’s slow to pull maiden up
- Pull girl over who is dawdling
- Moving slowly, coach takes girl back
- Pull lass back who’s last in line?
- Haul girl back, one going slowly
- Pull country girl back for being a slowcoach
- Haul girl up who’s falling behind
- Many tease girl about being a slowcoach
- Labour lass raised snail
- Late arriving? Force girl to stay up
Buddy explains!

The straight part
We know that "a slowcoach" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a slowcoach = laggard.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 LAGGARD mean?
LAGGARD noun- One who lags behind; one who takes more time than is necessary or than the others in a group.
- Lagging behind; taking more time than the others in a group.
- (animal husbandry) Not growing as quickly as the rest of the flock or herd.