Prolific poster heartlessly lying about plans again (6)
I believe the answer is:
remaps
'plans again' is the definition.
(I've seen this before)
'prolific poster heartlessly lying about' is the wordplay.
I cannot quite understand how this works, but
'about' could be 're' ('re' means regarding or about) and 're' is found in the answer.
The remaining letters 'maps' 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 remaps that I've seen before include "plans again" , "charts again" .)