The most common and most likely answer to this crossword clue is the 7 letter word ISOBARS
I've seen this crossword clue in The Guardian
I
S
O
B
A
R
S
More clues leading to the result ISOBARS
- One zooms around Belgian capital, seeing lines on a map
- What may be featured on map is overlooking hell for parched walkers?
- These describe Met lines, as Boris found out
- Signal for help around pub after one shows signs of pressure.
- … is – nothing obstructs curves
- Watering holes covered by unit thereby providing pressure indicators
- The closer one gets to one’s neighbours, the more likely things are to be tempestuous
- Feature of weather chart – rainbows all over the place, bar the northwest
- Bra is so tight, causing pressure lines
- Standard saloons have the same pressure
Buddy explains!
The straight part
We know that "lines on a map" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lines on a map = isobars.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 ISOBARS mean?
ISOBARS noun- A line drawn on a map or chart connecting places of equal or constant pressure.
- Either of two nuclides of different elements having the same mass number.
- A set of points or conditions at constant pressure.