Spell it out to me (4)
I believe the answer is:
time
'spell' is the definition.
(spell can mean a period of time)
'it out to me' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'it' is an anagram of 'ti'.
'ti'+'me'='TIME'
(Other definitions for time that I've seen before include "'Every ... we say goodbye, I cry a little' /Cole Porter" , "Prison sentence (colloq.)" , "Its detonation is delayed" , "The fourth dimension?" , "Rhythm" .)