Rotate chunk of rafter I failed to get burning (5)
I believe the answer is:
afire
'burning' is the definition.
(on fire)
'rotate chunk of rafter i failed to' is the wordplay.
'rotate' says the letters should be written in reverse (I've seen 'rotating' mean this).
'chunk of' indicates a hidden word.
'erifa' is hidden in the letters of 'rafter i failed to'.
'erifa' written backwards gives 'AFIRE'.
'get' acts as a link.
(Other definitions for afire that I've seen before include "lit up" , "Ablaze" , "Burning" , "in flames" , "Alight" .)