Just me to depend on? (6)
I believe the answer is:
merely
'just' is the definition.
(synonyms)
'me to depend on?' is the wordplay.
'to depend' becomes 'rely' (to depend on someone is to rely on them).
'on?' is a charade indicator (letters next to each other).
'me'+'rely'='MERELY'
(Other definitions for merely that I've seen before include "Just one" , "'Only, and nothing more (6)'" , "Simply - only" .)