Used to be squandered by Ted (3)
I believe the answer is:
was
'used to be' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for was that I've seen before include "(He/she) existed" , "Did live" , "Lived" , "Existed in the past" , "(I/he/she/it) existed" .)