The most common and most likely answer to this crossword clue is the 3 plus 4 letter word PIG IRON
I've seen this crossword clue in Financial Times
P
I
G
I
R
O
N
More clues leading to the result PIG IRON
- Scoffer joins press, producing crude output
- Regularly spying press in rough bars
- Very good soldier, chap that’s found in bars
- A lot of beer consumes dole money in rough bar
- Secure banking payment, crude stuff
- Metal bars, secure code protecting bank payment
- Crude metal clip to secure cheque
- Press chasing glutton for heavy metal in rough bars
- Heavy metal bars putting pressure on unusual origin
Buddy explains!

The straight part
We know that "Metal bars" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case metal bars = pig iron.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.