Trick poet with writing fluid (8)
I believe the answer is:
hoodwink
'trick' is the definition.
(I've seen this before)
'poet with writing fluid' is the wordplay.
'poet' becomes 'hood' (Thomas Hood, 1799-1845).
'with' becomes 'w' (abbreviation).
'writing fluid' becomes 'ink' (fluid used for writing).
'hood'+'w'+'ink'='HOODWINK'
(Other definitions for hoodwink that I've seen before include "Delude" , "Deceive - cheat" , "Mislead" , "Con" , "Put wool over eyes of" .)