The most common and most likely answer to this crossword clue is the 4 plus 1 plus 7 letter word BEAT A RETREAT
B
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A
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A
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T
More clues leading to the result BEAT A RETREAT
- Attend a sanctuary, and withdraw
- Attend American soldier’s party and make a run for it
- Live with a group of volunteers by convent and avoid unpleasantness?
- Forced retirement from one’s position
- Leave hastily and live in a monastery perhaps
- Son in New Delhi has a house, go back...
- Attend American sanctuary to withdraw
Buddy explains!

The straight part
We know that "go back" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case go back = beat a retreat.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.