The most common and most likely answer to this crossword clue is the 4 letter word DEAL
I've seen this crossword clue in Financial Times
D
E
A
L
More clues leading to the result DEAL
Buddy explains!

The straight part
We know that "Bargain" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bargain = deal.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 DEAL mean?
DEAL noun- A division, a portion, a share.
- (often followed by of) An indefinite quantity or amount; a lot (now usually qualified by great or good).
- An act of dealing or sharing out.
- The distribution of cards to players; a player's turn for this.
- A particular instance of buying or selling; a transaction
- Specifically, a transaction offered which is financially beneficial; a bargain.
- An agreement between parties; an arrangement
- A situation, occasion, or event.
- A thing, an unspecified or unidentified object.
- To distribute among a number of recipients, to give out as one’s portion or share.
- To administer or give out, as in small portions.
- To distribute cards to the players in a game.
- To pitch.
- To have dealings or business.
- To conduct oneself, to behave.
- To take action; to act.
- To trade professionally (followed by in).
- To sell, especially to sell illicit drugs.
- To be concerned with.
- To handle, to manage, to cope.
- Wood that is easy to saw (from conifers such as pine or fir).
- A plank of softwood (fir or pine board).
- A wooden board or plank, usually between 12 or 14 feet in length, traded as a commodity in shipbuilding.
- Made of deal.