The most common and most likely answer to this crossword clue is the 12 letter word RETROGRADELY
R
E
T
R
O
G
R
A
D
E
L
Y
Buddy explains!
The straight part
We know that "How Roger Daltrey could make a comeback" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case how roger daltrey could make a comeback = retrogradely.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.