The most common and most likely answer to this crossword clue is the 5 plus 2 plus 8 letter word POWER OF ATTORNEY
I've seen this crossword clue in The Sunday Telegraph
P
O
W
E
R
O
F
A
T
T
O
R
N
E
Y
More clues leading to the result POWER OF ATTORNEY
- Might a Tory often upset official delegation?
- Wrote of poetry and briefly about legal document
- Authorising document is lawyer’s strength
- Prisoner, rich and spoilt, shackled by eye or dubious legal authority
- Wrong waterproof on, yet right legally
- Lawyer’s influence is used to appoint a representative
- We got involved in arranging notary for poet as a proxy legal authority
Buddy explains!
The straight part
We know that "right legally" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case right legally = power of attorney.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.