The most common and most likely answer to this crossword clue is the 8 letter word BACKPACK
I've seen this crossword clue in Financial Times
B
A
C
K
P
A
C
K
More clues leading to the result BACKPACK
- Support Wolves? This might be checked at entrance to ground
- Second group to go hiking
- Second group of scouts to go travelling
- Wolves supporter may do this to travel simply
- Go hiking – support Wolves perhaps?
- Hike — second by rugby forwards
- Champion stuff, hiking gear
- Bag second set of suits
- Second team’s kit carrier
- What hiker needs to drive away wolves?
Buddy explains!

The straight part
We know that "Bag" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bag = backpack.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 BACKPACK mean?
BACKPACK noun- A knapsack, sometimes mounted on a light frame, but always supported by straps, worn on a person’s back for the purpose of carrying things, especially when hiking, or on a student's back when carrying books.
- A similarly placed item containing a parachute or other life-support equipment.
- To hike and camp overnight in backcountry with one's gear carried in a backpack
- To engage in low-cost, generally urban, travel with minimal luggage and frugal accommodations
- To place or carry (an item or items) in a backpack