Tired of wordy novel about head of state (6)
I believe the answer is:
drowsy
'tired' is the definition.
(I've seen this before)
'wordy novel about head of state' is the wordplay.
'novel' is an anagram indicator.
'about' is an insertion indicator.
'head of' suggests taking the first letters.
The first letter of 'state' is 's'.
'wordy' with letters rearranged gives 'drowy'.
'drowy' going around 's' is 'DROWSY'.
'of' is the link.
(Other definitions for drowsy that I've seen before include "Sleepy, somnolent" , "Comatose" , "Sleepy, half-asleep" , "Nodding off" , "Dull" .)