Climbing mountains, call to spare no expense (6,3)
I believe the answer is:
splash out
'spare no expense' is the definition.
Both the answer and definition are verbs in their base form.
Maybe they are linked in a way I don't understand?
'climbing mountains call' is the wordplay.
'climbing' says the letters should be written in reverse (in a down clue, letters climb up).
'mountains' becomes 'alps' (European mountain range).
'call' becomes 'shout' (synonyms).
'alps' written backwards gives 'spla'.
'spla'+'shout'='SPLASH OUT'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for splash out that I've seen before include "Spend money freely" , "extravagant" , "Spend a lot of money" , "Blow brass" .)