Tired of scrambled egg being in fashion (6)
I believe the answer is:
fagged
'tired' is the definition.
('fagged' can be similar in meaning to 'tired')
'scrambled egg being in fashion' is the wordplay.
'scrambled' indicates an anagram.
'being in' is an insertion indicator.
'fashion' becomes 'fad' (fad is a kind of fashion).
'egg' with letters rearranged gives 'gge'.
'gge' going inside 'fad' is 'FAGGED'.
'of' acts as a link.
(Other definitions for fagged that I've seen before include "whacked?" , "becoming tired" , "Worked for prefect" , "Of work, made tired" , "Was a servant at Eton" .)