Constructed in unoriginal style (7)
I believe the answer is:
rebuilt
'constructed in unoriginal style' is the definition.
'rebuilt' can be an answer for 'constructed' (rebuilding is a kind of constructing). I'm not sure about the 'in unoriginal style' bit.
'constructed in' is the wordplay.
I cannot quite understand how this works, but
'constructed' could be 'built' ('build' can be a synonym of 'construct') and 'built' is present in the answer.
The remaining letters 're' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for rebuilt that I've seen is " Again put up".)