Poorly penning vacuous dodgy poem (5)
I believe the answer is:
idyll
'poem' is the definition.
(type of poem)
'poorly penning vacuous dodgy' is the wordplay.
'poorly' becomes 'ill' (similar in meaning).
'penning' indicates putting letters inside.
'vacuous' means to remove the middle letters.
'dodgy' with its centre removed is 'dy'.
'ill' going around 'dy' is 'IDYLL'.
(Other definitions for idyll that I've seen before include "Charming life in the country" , "Blissful pastoral scene" , "very happy situation" , "Blissful period" , "Idealised prose" .)