Cut a sleep out to reflect (9)
I believe the answer is:
speculate
'reflect' is the definition.
(synonyms)
'cut a sleep out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'cut'+'a'+'sleep'='cutasleep'
'cutasleep' is an anagram of 'SPECULATE'.
'to' acts as a link.
(Other definitions for speculate that I've seen before include "Imagine" , "Bet; theorise" , "Form opinion without definite knowledge" , "As before, observe" , "Guess without knowing the facts" .)