Further times and further time included in time (5)
I believe the answer is:
extra
'further' is the definition.
(I've seen this before)
'times and further time included in time' is the wordplay.
'times' becomes 'x' (x resembles the multiplication or times sign).
'and' says to put letters next to each other.
'further time' becomes 't' (abbreviation. I am not sure about the 'further' bit.).
'included in' is an insertion indicator.
'time' becomes 'era' (an era is a period of time).
'x'+'t'='xt'
'xt' put inside 'era' is 'EXTRA'.
Can you help me to learn more?
(Other definitions for extra that I've seen before include "unused" , "Actor in non-speaking role" , "23 player?" , "Sundry" , "appearing in crowd scene" .)