The most common and most likely answer to this crossword clue is the 7 letter word GALAHAD
I've seen this crossword clue in Financial Times
G
A
L
A
H
A
D
More clues leading to the result GALAHAD
- Girl was forced to set about a noble adventurer
- Errant fellow held after festivity
- Noble fellow cheated on the first female?
- *Celebration possessed him
- Festivity with experienced knight
- Pageant entertained man of honour
- Noble fellow experienced festivity in the first place
- Knight had to go after festival
- … from festivity, having cheated knight
- Lady took the heart of foward knight?
Buddy explains!

The straight part
We know that "him" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case him = galahad.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.