Sickly dose of poetry (4)
I believe the answer is:
odes
'poetry' is the definition.
(ode is a type of poem)
'sickly dose' is the wordplay.
'sickly' is an anagram indicator (I've seen this in other clues).
'dose' is an anagram of 'ODES'.
'of' acts as a link.
(Other definitions for odes that I've seen before include "Verses" , "Lyrical poems" , "Poets write them" , "Works by Pindar" , "Songs" .)