Additional time to collect Times and Time? (5)
I believe the answer is:
extra
'additional' is the definition.
(extra means additional or surplus)
'time to collect times and time?' is the wordplay.
'time' becomes 'era' (an era is a period of time).
'to collect' is an insertion indicator (inserted letters are collected by others).
'times' becomes 'x' (r times 4 is r x 4).
'and' means one lot of letters go next to another.
'time?' becomes 't' (abbreviation).
'x'+'t'='xt'
'era' enclosing 'xt' is 'EXTRA'.
(Other definitions for extra that I've seen before include "Left over" , "One playing small part" , "person in shot?" , "Taxer (anag.)" , "Another" .)