Opposed to complex contract (8)
I believe the answer is:
condense
'contract' is the definition.
(I know that contract can be written as condense)
'opposed to complex' is the wordplay.
'opposed to' becomes 'con' (I've seen this in another clue).
'complex' becomes 'dense' (I am not sure about this - if you are sure you should believe this answer much more).
'con'+'dense'='CONDENSE'
Can you help me to learn more?
(Other definitions for condense that I've seen before include "Summarise" , "Turn from gas to liquid" , "Abbreviate" , "Make more concentrated, or express in fewer words" , "Compress or shrink" .)