Remains in the countryside (6)
I believe the answer is:
sticks
'countryside' is the definition.
(thesaurus)
'remains in the' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
The remaining letters 'sicks' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for sticks that I've seen before include "Old fogeys" , "Is bogged down" , "Refuses to move" , "Small pieces of wood" , "''... and stones may break my bones but names will never hurt me''" .)