The most common and most likely answer to this crossword clue is the 7 letter word CHUFFED
I've seen this crossword clue in Financial Times
C
H
U
F
F
E
D
Buddy explains!

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 CHUFFED mean?
CHUFFED verb- To make noisy puffing sounds, as of a steam locomotive.
- To break wind.
- To intermittently extinguish and reignite a powder charge.
- Very pleased or satisfied; delighted.
- Disgruntled, displeased, unsatisfied (This word can be its own antonym. [Is this slang, sarcasm, reverse psychology, etc?])