The most common and most likely answer to this crossword clue is the 11 letter word REPLENISHED
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Buddy explains!
The straight part
We know that "topped up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case topped up = replenished.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 REPLENISHED mean?
REPLENISHED verb- To refill; to renew; to supply again or to add a fresh quantity to.
- To fill up; to complete; to supply fully.
- To finish; to complete; to perfect.
- Imbued, fully infused (with) some quality.
- Full, fully stocked (with), containing an abundance (of).
- That has been refilled; restored to capacity or fullness, full.