The most common and most likely answer to this crossword clue is the 10 letter word REINFORCED
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More clues leading to the result REINFORCED
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The straight part
We know that "Added to" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case added to = reinforced.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 REINFORCED mean?
REINFORCED verb- To strengthen, especially by addition or augmentation.
- To emphasize or review.
- To encourage (a behavior or idea) through repeated stimulus.
- Having been or containing reinforcement