Inventor's time at Twickers being up (6)
I believe the answer is:
edison
'inventor's' is the definition.
(I know that Edison is a inventors)
'time at twickers being up' is the wordplay.
I cannot quite understand how this works, but
'at' could be 'on' (location) and 'on' is present in the answer.
'up' could be 'is' (I've seen this in other clues) and 'is' is found in the answer.
The remaining letters 'ed' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for edison that I've seen before include "Thomas Alva ......, great American inventor" , "No side to this american inventor" , "Prolific inventor" , "He came up with microphone" , "Early American inventor" .)