Episode exactly on time (5)
I believe the answer is:
event
'episode' is the definition.
(I've seen this before)
'exactly on time' is the wordplay.
'exactly on' becomes 'even' (I can't explain this - if you can you should believe this answer much more).
'time' becomes 't' (abbreviation).
'even'+'t'='EVENT'
Can you help me to learn more?
(Other definitions for event that I've seen before include "A notable occurrence or happening" , "Occurence, occasion" , "Happening, incident" , "special occasion" , "one item in programme" .)