Show boredom in November, way back (4)
I believe the answer is:
yawn
'show boredom' is the definition.
(I've seen this before)
'november way back' is the wordplay.
'november' becomes 'N' (phonetic alphabet: alpha, bravo, charlie etc.).
'back' says the letters should be written in reverse.
'n'+'way'='nway'
'nway' written backwards gives 'YAWN'.
'in' is the link.
(Other definitions for yawn that I've seen before include "Boring event" , "Bored sign" , "Involuntary sign of tiredness or boredom" , "Oscitate" , "Mouth-stretching" .)