The most common and most likely answer to this crossword clue is the 6 letter word FILLED
I've seen this crossword clue in The Sunday Telegraph
F
I
L
L
E
D
Buddy explains!
The straight part
We know that "being satisfied" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case being satisfied = filled.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 FILLED mean?
FILLED verb- To occupy fully, to take up all of.
- To add contents to (a container, cavity or the like) so that it is full.
- To enter (something), making it full.
- To become full.
- To become pervaded with something.
- To satisfy or obey (an order, request or requirement).
- To install someone, or be installed, in (a position or office), eliminating a vacancy.
- To treat (a tooth) by adding a dental filling to it.
- To fill or supply fully with food; to feed; to satisfy.
- To trim (a yard) so that the wind blows on the after side of the sails.
- (of a male) To have sexual intercourse with (a female).
- (followed by with) That is now full.