Arrive outside place and run electronic machine (8)
I believe the answer is:
computer
'electronic machine' is the definition.
(I've seen this before)
'arrive outside place and run' is the wordplay.
'arrive' becomes 'come' (coming is a kind of arriving**).
'outside' indicates putting letters inside.
'place' becomes 'put' ('put' can be a synonym of 'place').
'and' means one lot of letters go next to another.
'run' becomes 'r' (cricket abbreviation).
'come' enclosing 'put' is 'compute'.
'compute'+'r'='COMPUTER'
(Other definitions for computer that I've seen before include "Electronic calculator" , "Curt poem about electronic machine" , "Electronic device for processing data" , "Comer put out by data processing machine" , "Eg, laptop" .)