The most common and most likely answer to this crossword clue is the 8 letter word ONSCREEN
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Buddy explains!
The straight part
We know that "like a TV picture" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case like a tv picture = onscreen.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does ONSCREEN mean?
ONSCREEN adjective- As seen on a screen (as of television, film, or computer) rather than in real life.
- Inside the frame of the cinema, television or computer screen.