Seat is rearranged for rest of afternoon (6)
I believe the answer is:
siesta
'rest of afternoon' is the definition.
'siesta' can be an answer for 'rest' (I've seen this in another clue). I'm unsure of the 'of afternoon' bit.
'seat is rearranged' is the wordplay.
'rearranged' indicates anagramming the letters.
'seat'+'is'='seatis'
'seatis' with letters rearranged gives 'SIESTA'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for siesta that I've seen before include "Afternoon nap in a warm climate" , "PM snoozing?" , "Afternoon break" , "Afternoon relaxation" , "An afternoon nap in Spain" .)