The most common and most likely answer to this crossword clue is the 8 letter word RECESSED
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Buddy explains!

The straight part
We know that "along the lines of bay" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case along the lines of bay = recessed.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 RECESSED mean?
RECESSED verb- To inset into something, or to recede.
- To take or declare a break.
- To appoint, with a recess appointment.
- To make a recess in.
- Set back; located in a hole, space, or opening.
- Withdrawn; secluded
- Having a recess or nook