Overlook reminder? Sounds like blunder (6)
I believe the answer is:
miscue
'blunder' is the definition.
(thesaurus)
'overlook reminder?' is the wordplay.
'overlook' becomes 'mis' (I can't justify this - if you can you should give a lot more credence to this answer).
'reminder?' becomes 'cue' (eg a cue for an actor on stage).
'mis'+'cue'='MISCUE'
'sounds like' is the link.
Can you help me to learn more?
(Other definitions for miscue that I've seen before include "Faulty strike" , "Faulty shot on the green baize" , "Bad hit in snooker" , "going to pot" , "Hit snooker ball badly" .)