One leaves emptier after initially trusting someone leading us astray (7)
I believe the answer is:
tempter
'trusting someone leading us astray' is the definition.
I can't tell whether this defines the answer.
'one leaves emptier after initially' is the wordplay.
'one' becomes 'i' (Roman numeral).
'leaves' is a deletion indicator.
'after' becomes 't' (I am not sure about this - if you are sure you should believe this answer much more).
'initially' says to put letters next to each other (some letters go before others).
'emptier' with 'i' taken out is 'empter'.
'empter' put after 't' is 'TEMPTER'.
Can you help me to learn more?
(Other definitions for tempter that I've seen before include "seducer" , "Someone offering enticements" , "Satan" , "One offering enticement" , "One offering enticements" .)