The most common and most likely answer to this crossword clue is the 7 letter word STORING
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More clues leading to the result STORING
Buddy explains!

The straight part
We know that "Keeping" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case keeping = storing.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 STORING mean?
STORING verb- To keep (something) while not in use, generally in a place meant for that purpose.
- To write (something) into memory or registers.
- An amount stored.