The most common and most likely answer to this crossword clue is the 6 letter word BARTER
B
A
R
T
E
R
More clues leading to the result BARTER
Buddy explains!

The straight part
We know that "Trade" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case trade = barter.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 BARTER mean?
BARTER noun- An exchange of goods or services without the use of money.
- The goods or services used in such an exchange.
- To exchange goods or services without involving money.