The most common and most likely answer to this crossword clue is the 7 letter word BUTCHER
I've seen this crossword clue in The Times
B
U
T
C
H
E
R
More clues leading to the result BUTCHER
- One selling joints in bar in Montmartre, not cheap
- Very masculine ruler in ruin
- More aggressively masculine slaughter
- Killer only dear to the French
- More like a man to mess up?
- Save lady who sings more like a man
- Killer arse almost on pop star
- In EastEnders, Pat maybe more manly
- To hack into pieces is more macho
- Less like lamb from this supplier?
Buddy explains!

The straight part
We know that "Killer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case killer = butcher.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 BUTCHER mean?
BUTCHER noun- A person who prepares and sells meat (and sometimes also slaughters the animals).
- A brutal or indiscriminate killer.
- (from butcher's hook) A look.
- A person who sells candy, drinks, etc. in theatres, trains, circuses, etc.
- To slaughter (animals) and prepare (meat) for market.
- To kill brutally.
- To ruin (something), often to the point of defamation.
- (originally Polari) Very masculine, with a masculine appearance or attitude.