Set up a trap you long to attract with (7)
I believe the answer is:
bewitch
'attract with' is the definition.
'bewitch' can be an answer for 'attract' (bewitching is a kind of attracting). I'm not sure about the 'with' bit.
'set up a trap you long' is the wordplay.
'set up' shows that the letters should be reversed in order (in a down clue, letters go up).
'a trap you' becomes 'web' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'long' becomes 'itch' (to long or itch for something is to desire it).
'web' back-to-front is 'bew'.
'bew'+'itch'='BEWITCH'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for bewitch that I've seen before include "Get intoxicated" , "Put under a spell, or delight" , "Spellbind" , "Fascinate - charm" , "Put under a magic spell, or charm" .)