Had a fling (5)

I believe the answer is:

threw

I'm a little stuck... Click here to teach me more about this clue!

'had' is the definition.
('throw' can be a synonym of 'have')

I cannot understand how the rest of the clue works.

(Other definitions for threw that I've seen before include "Disconcerted" , "Propelled through the air" , "Bowled unfairly" , "Projected through the air" , "Confused" .)

Want a hint initially instead of a full solution? Install my app