Keys mislaid in Scottish island? (4)
I believe the answer is:
skye
'scottish island?' is the definition.
(I've seen this before)
'keys mislaid' is the wordplay.
'mislaid' is an anagram indicator.
'keys' with letters rearranged gives 'SKYE'.
'in' acts as a link.
(Other definitions for skye that I've seen before include "Largest Inner Hebridean island" , "Scottish isle" , "Scot. island, toll bridge" , "Scots isle" , "Island in a boat song about Flora MacDonald and Bonnie Prince Charlie" .)