Turn seat, lifting lid (5)
I believe the answer is:
addle
'turn' is the definition.
(thesaurus)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for addle that I've seen before include "Confuse; go off" , "Get confused" , "Confuse; become rotten" , "Befuddle" , "(Of eggs) become rotten" .)