Had a go at casual worker after attending inspirational talk (9)

'had a go' is the definition.
The definition and answer can be both to do with creating things as well as being past participle verbs.
Maybe they are linked in a way I don't understand?

'casual worker after attending inspirational talk' is the wordplay.
'casual worker' becomes 'temp' (short-term or temporary worker).
'after' is a charade indicator (letters next to each other).
'attending' becomes 'at' (e.g. at school means attending school).
'inspirational talk' becomes 'ted' (I can't justify this - if you can you should believe this answer much more).
'temp' after 'at' is 'attemp'.
'attemp'+'ted'='ATTEMPTED'

'at' is the link.

Can you help me to learn more?