Most unsophisticated Scotsman lifted top (7)
I believe the answer is:
naivest
'most unsophisticated' is the definition.
('naive' can be similar in meaning to 'unsophisticated')
'scotsman lifted top' is the wordplay.
'scotsman' becomes 'ian' (common Scottish name).
'lifted' is a reversal indicator (going up in down clue).
'top' becomes 'vest' (I've seen this before).
'ian' reversed gives 'nai'.
'nai'+'vest'='NAIVEST'
(Other definitions for naivest that I've seen before include "Least sophisticated" , "Most unsophisticated" , "far from the most wise?" , "Most simple" , "very green" .)