Thatcherism is not smart, creative or up to date, technology wise (2-4)
I believe the answer is:
hi-tech
'up to date technology wise' is the definition.
I can't tell whether this defines the answer.
'thatcherism is not smart creative' is the wordplay.
'is not' is a deletion indicator.
'creative' is an anagram indicator.
'thatcherism' with 'smart' removed is 'htchei'.
'htchei' with letters rearranged gives 'HI-TECH'.
'or' is the link.
Can you help me to learn more?
(Other definitions for hi-tech that I've seen before include "Using modern construction" , "Electronically advanced" , "Advanced technology" , "(Using) the latest developments" , "Using the latest science" .)