Kind of complex reference work, one on China (7)
I believe the answer is:
oedipal
'kind of complex' is the definition.
'reference work one on china' is the wordplay.
'reference work' becomes 'oed'.
'one' becomes 'i' (Roman numeral).
'on' says to put letters next to each other.
'china' becomes 'pal' (I've seen this before**).
'oed'+'i'+'pal'='OEDIPAL'
(Other definitions for oedipal that I've seen before include "Relating to a son/mother complex" , "Type of complex" , "Like a boy desiring his mother" , "type of conflict arising in Greece" , "Like a complex" .)