Trick that's bad played on us -- I'll get caught (8)
I believe the answer is:
illusion
'trick' is the definition.
(synonyms)
'that's bad played on us i'll get caught' is the wordplay.
'that's bad' becomes 'ill' (associated in meaning).
'played' indicates anagramming the letters.
'i'll' becomes 'i' (this might be a standard abbreviation I've not previously seen).
'get caught' indicates putting letters inside (inserted letters get caught inside).
'on'+'us'='onus'
'onus' with letters rearranged gives 'uson'.
'uson' placed around 'i' is 'usion'.
'ill'+'usion'='ILLUSION'
Can you help me to learn more?
(Other definitions for illusion that I've seen before include "False impression" , "False appearance" , "Something a person wrongly believes to exist" , "False vision or mirage (8)" , "Deception" .)