Indeed, half of picture’s shown (8)
I believe the answer is:
depicted
'shown' is the definition.
('depict' can be a synonym of 'show')
'indeed half of picture's' is the wordplay.
I cannot quite understand how this works, but
'picture' could be 'depict' (synonyms) and 'depict' is found within the answer.
The remaining letters 'ed' is a valid word 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 depicted that I've seen before include "Shown" , "Described or portrayed in words" .)