Sergeant perhaps breaking into song in historic Scots village (7)
I believe the answer is:
glencoe
'historic scots village' is the definition.
The definition suggests a singular noun which matches the answer.
'sergeant perhaps breaking into song' is the wordplay.
'sergeant perhaps' becomes 'nco' (I can't explain this - if you can you should give a lot more credence to this answer).
'breaking into' means one lot of letters goes inside another.
'song' becomes 'glee' (I've seen this in another clue).
'nco' inserted inside 'glee' is 'GLENCOE'.
'in' is the link.
Can you help me to learn more?
(Other definitions for glencoe that I've seen before include "Scots valley where Campbells massacred McDonalds" , "Where Campbells massacred MacDonalds in Scotland" , "Death Valley" , "Scots site of massacre" , "Valley near Ben Nevis" .)