He'll trot out some familiar fiction (4)
I believe the answer is:
liar
'he'll trot out' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'some familiar fiction' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'LIAR' is hidden in the letters of 'familiar fiction'.
Can you help me to learn more?
(Other definitions for liar that I've seen before include "Teller of fibs" , "Person telling stories" , "Perjuror" , "Fibber" , "One supplying pork pies" .)