Caught participating in saucy duets with Thaddeus (3)
I believe the answer is:
had
'caught participating in saucy duets' is the definition.
The definition and answer can be both related to change as well as being past participle verbs.
Maybe they are linked in a way I don't understand?
'with thaddeus' is the wordplay.
'with' indicates the answer is hidden within the clue.
'HAD' can be found hidden inside 'thaddeus'.
Can you help me to learn more?
(Other definitions for had that I've seen before include "kept" , "Was in possession of" , "Was bound to be - caught" , "Possessed; cheated" , "Owned in the past" .)