In a catalogue, stick climber (8)
I believe the answer is:
alpinist
'climber' is the definition.
(I've seen this before)
'in a catalogue stick' is the wordplay.
'in' is an insertion indicator.
'catalogue' becomes 'list' (I've seen this before).
'stick' becomes 'pin' ('pin' can be a synonym of 'stick'**).
'a'+'list'='alist'
'alist' enclosing 'pin' is 'ALPINIST'.
(Other definitions for alpinist that I've seen before include "Maker of sharp climb" , "one climbs" , "Climber of big mountains" , "mountaineer" .)