After finishing Listener 4810 without requiring help from the forum *gasp!*, I've come back to this puzzle in hopes of cracking the endgame.
I have a completely filled grid, but seem to have come unstuck finding the correct discarded letter when parsing 25d to 32d inclusive.
25d: The first word ‘In’ suggests a word for ‘look’ reversed goes inside a word for ‘cyberspace’, with the last letter discarded. But this gives an alternative spelling of the word I have in the grid…
28d: Similarly, wordplay indicates a word for ‘hardliner’ - minus a discarded letter? - inside a word for ‘talk’, ALL reversed. But the grid entry has only the word for ‘talk’ reversed…
29d Fairly sure discarded letter is G.
30d is one of the jumbled words.
32d Can't find a word for ‘Hasten` to fit with grid entry.
I have the instruction (6 words), followed by a single word for the theme’s source; should this be two words?
All helps and hints gratefully received.