The most common and most likely answer to this crossword clue is the 7 letter word HUMANER
I've seen this crossword clue in The Guardian
H
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Buddy explains!
The straight part
We know that "More compassionate" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case more compassionate = humaner.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 HUMANER mean?
HUMANER adjective- (notcomp) Of or belonging to the species Homo sapiens or its closest relatives.
- Having the nature or attributes of a human being.
- Having or showing concern for the pain or suffering of another; compassionate.
- Pertaining to branches of learning concerned with human affairs or the humanities, especially classical literature or rhetoric.