Opponent of new technology did play instrument outside (7)
I believe the answer is:
luddite
'opponent of new technology' is the definition.
(I've seen this before)
'did play instrument outside' is the wordplay.
'play' indicates an anagram.
'instrument' becomes 'lute' (lute is a kind of instrument).
'outside' is an insertion indicator (some letters go outside others).
'did' with letters rearranged gives 'ddi'.
'ddi' going inside 'lute' is 'LUDDITE'.
(Other definitions for luddite that I've seen before include "Mechanisation resister" , "Opposer of mechanisation" , "Early nineteenth century anti-machinery demonstrator" , "Diluted for old machinery wrecker" , "protesting worker" .)