The most common and most likely answer to this crossword clue is the 4 plus 2 plus 3 letter word MAKE UP FOR
I've seen this crossword clue in The Guardian
M
A
K
E
U
P
F
O
R
Buddy explains!
The straight part
We know that "Redress" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case redress = make up for.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.