Told tales in randy fashion about an egghead (6)
I believe the answer is:
yarned
'told tales' is the definition.
(I've seen this before)
'randy fashion about an egghead' is the wordplay.
'fashion' indicates anagramming the letters.
'about' is an insertion indicator.
'an egghead' becomes 'e' (head letter of 'egg').
'randy' with letters rearranged gives 'yarnd'.
'yarnd' going around 'e' is 'YARNED'.
'in' acts as a link.
(Other definitions for yarned that I've seen before include "Told tales" , "Told stories - sounds woolly" , "Told stories - sound woolly" , "Swapped stories - sounds woolly" , "Told or swapped stories" .)