Put German on that's up in the Alps (5)
I believe the answer is:
eiger
'the alps' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's a link between them I don't understand?
'put german on that's up' is the wordplay.
'put' indicates putting letters inside.
'german' becomes 'g' (abbreviation).
'on' becomes 're' ('on' can be mean 'with reference to').
'that's' becomes 'ie' (abbreviation for 'id est', 'that is' in Latin).
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
're'+'ie'='reie'
'g' inserted inside 'reie' is 'regie'.
'regie' in reverse letter order is 'EIGER'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for eiger that I've seen before include "Alpine mountain" , "Famous Swiss mountain" , "North wall mountain" , "Mount" , "Swiss mountain with a notorious north face" .)