New climb just starting (7)
I believe the answer is:
nascent
'starting' is the definition.
(I've seen this before)
'new climb' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'climb' becomes 'ascent' (synonyms).
'n'+'ascent'='NASCENT'
'just' is the link.
(Other definitions for nascent that I've seen before include "Beginning to show signs of potential" , "Starting to develop" , "Just beginning existence" , "just coming into effect" , "starting to happen" .)