Long lead for electric current must be plugged into computer (4)
I believe the answer is:
epic
'long' is the definition.
(as in an epic story)
'lead for electric current must be plugged into computer' is the wordplay.
I cannot quite see how this works, but
'current' could be 'i' (symbol for electric current) and 'i' is found in the answer.
'computer' could be 'pc' (personal computer) and 'pc' is found within the remaining letters.
A single letter 'e' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for epic that I've seen before include "Long classic film" , "major work" , "of impressive proportions?" , "A long poem or book with adventurous theme" , "Long poem telling of heroic events" .)