seconds after, succeeded stabbing the flying lover-boy with arrows and teeth! (7)

'teeth' is the definition.
(cuspid is a kind of tooth)

'seconds after succeeded stabbing the flying lover-boy' is the wordplay.
'seconds' becomes 's' (abbreviation).
'after' means one lot of letters go next to another.
'succeeded' becomes 's' (genealogical abbreviation).
'stabbing' indicates putting letters inside (some letters stab themselves into others).
'the flying lover boy' becomes 'cupid' (I can't justify this - if you can you should give a lot more credence to this answer).
's' put inside 'cupid' is 'cuspid'.
's' after 'cuspid' is 'CUSPIDS'.

'with arrows and' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?