Just me to depend on? (6)
I believe the answer is:
merely
'just' is the definition.
(I know that just can be written as merely)
'me to depend on?' is the wordplay.
'to depend' becomes 'rely' (to depend on someone is to rely on them).
'on?' means one lot of letters go next to another.
'me'+'rely'='MERELY'
(Other definitions for merely that I've seen before include "Just one" , "'Only, and nothing more (6)'" , "Simply - only" .)