Leaning on catalogue (7)
I believe the answer is:
listing
I believe this clue is a double definition.
'leaning' is the first definition.
(thesaurus)
'catalogue' is the second definition.
(I've seen this before)
'on' acts as a link.
(Other definitions for listing that I've seen before include "catalogue" , "Not going straight" , "Keeling over" , "Enumerating" .)