Singer from Scotland turning up (4)
I believe the answer is:
alto
'singer' is the definition.
(type of singing voice)
'from scotland turning up' is the wordplay.
'from' indicates the answer is hidden within the clue.
'turning up' says the letters should be written in reverse.
'otla' is hidden in the letters of 'scotland'.
'otla' written backwards gives 'ALTO'.
(Other definitions for alto that I've seen before include "High male singing voice" , "Low female singing voice" , "Male singer" , "Key old > male who scores high" , "Singing range" .)