Lonely type behind upwardly mobile Chinese people (6)
I believe the answer is:
orphan
'lonely type' is the definition.
(child whose parents are dead)
'behind upwardly mobile chinese people' is the wordplay.
'behind' becomes 'pro' (to be pro something is to be behind it).
'upwardly mobile' is a reversal indicator.
'chinese people' becomes 'han' (Chinese dynasty).
'pro' written backwards gives 'orp'.
'orp'+'han'='ORPHAN'
(Other definitions for orphan that I've seen before include "One standing alone" , "Child without parent" , "Child with no living parents" , "little Annie, maybe?" , "Child bereft of parents" .)