I climb mountain close to Tibet, with a lot of expertise provided (3,4)
I believe the answer is:
ski lift
'i climb mountain' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'close to tibet with a lot of expertise provided' is the wordplay.
'close to' suggests the final letters (the close/ending of).
'with' says to put letters next to each other.
'a lot of expertise' becomes 'skil' (I can't justify this - if you can you should believe this answer much more).
'provided' becomes 'if' (eg 'provided it's sunny' means 'if it's sunny').
The last letter of 'tibet' is 't'.
'skil'+'if'='skilif'
't' put after 'skilif' is 'SKI-LIFT'.
Can you help me to learn more?
(Other definitions for ski lift that I've seen before include "means of transport" , "Device for transporting people to top of piste" , "Winter sports ride" , "Alpine transport system" , "Winter sports elevator" .)