Suceptible to fall for a trick (7)
I believe the answer is:
cantrip
'trick' is the definition.
(thesaurus)
'suceptible to fall for a' is the wordplay.
'suceptible' becomes 'c' (I can't explain this - if you can you should give a lot more credence to this answer).
'to fall' becomes 'trip' (as in tripping over).
'for' means one lot of letters go next to another (I've seen this in other clues).
'a' becomes 'an'.
'trip' put after 'an' is 'antrip'.
'c'+'antrip'='CANTRIP'
Can you help me to learn more?
(Other definitions for cantrip that I've seen before include "Witch's trick" , "Piece of mischief" , "(Scottish spelling)" , "bit of mischief" , "Magical spell" .)