List some of the obstacles I met in climbing (7)
I believe the answer is:
itemise
'list' is the definition.
(to itemise is to create a list)
'some of the obstacles i met in climbing' is the wordplay.
'some of' indicates the answer is hidden within the clue.
'climbing' says the letters should be written backwards (in a down clue, letters climb up).
'esimeti' is hidden in the letters of 'obstacles i met in'.
'esimeti' written backwards gives 'ITEMISE'.
(Other definitions for itemise that I've seen before include "Read off list of things one by one" , "Using spell out" , "Set down separately" , "List one by one (S, not Z)" , "Specify individually" .)