Clue: Song from Scandinavian about climbing in south-east (8)
Answer: SERENADE
Explanation: Definition: Song
An envelope ('in') of ERENAD, a reversal ('climbing') in a down light) of DANE ('Scandinavian'; you may think of Scandinavia as covering just Norway and Sweden, but there are grounds for including Denmark and even Iceland) plus RE ('about' – at last, not the envelope nor the reversal, but the right purpose for this word in this clue) in SE ('south-east').