The most common and most likely answer to this crossword clue is the 4 plus 3 plus 1 letter word MAKE DO} –
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Buddy explains!

The straight part
We know that "Manage" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case manage = make do} –.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 MAKE DO} – mean?
MAKE DO} – noun- A temporary or makeshift expedient.
- Improvised, makeshift