Straight in, real switches (6)
I believe the answer is:
linear
'straight' is the definition.
(I've seen this before)
'in real switches' is the wordplay.
'switches' is an anagram indicator (I've seen 'switch' mean this).
'in'+'real'='inreal'
'inreal' anagrammed gives 'LINEAR'.
(Other definitions for linear that I've seen before include "-- Motor; -- equation" , "One-dimensional" , "adopting common narrative style" , "Like some ancient scripts" , "Straight; sequential" .)