To give a low fellow promises of money, seems strange (7)
I believe the answer is:
curious
'strange' is the definition.
('curious' can be a synonym of 'strange')
'to give a low fellow promises' is the wordplay.
'to give' is a charade indicator (letters next to each other).
'a low fellow' becomes 'cur' (I can't explain this - if you can you should believe this answer much more).
'promises' becomes 'ious' (IOU's, promises to pay a debt).
'cur' next to 'ious' is 'CURIOUS'.
'of money seems' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for curious that I've seen before include "Odd - inquisitive" , "Keen to learn" , "Intrigued" , "Eager to learn, strange" , "Unusual; eager to learn" .)