Terms of trade included tender (4)
I believe the answer is:
soft
'tender' is the definition.
(similar in meaning)
'terms of trade included' is the wordplay.
'included' says the answer is hidden in the clue (I've seen 'including' mean this).
'SOFT' is hidden in the letters of 'terms of trade'.
(Other definitions for soft that I've seen before include "firm? On the contrary" , "Seat" , "Gentle - simple" , "foolish" , "Pliant" .)