Key in hotel changed without using electronics (2-4)
I believe the answer is:
lo-tech
'without using electronics' is the definition.
(as opposed to hi-tech)
'key in hotel changed' is the wordplay.
'key' becomes 'c' (musical key).
'in' indicates putting letters inside.
'changed' is an anagram indicator.
'hotel' is an anagram of 'loteh'.
'c' placed inside 'loteh' is 'LO-TECH'.
I've seen this clue in The Guardian.
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