Hid from new boss, almost better (8)
I believe the answer is:
obscured
'hid' is the definition.
(obscuring is a kind of hiding)
'new boss almost better' is the wordplay.
'new' indicates an anagram.
'almost' means to remove the last letter (most of the word but not all of it).
'better' becomes 'cured' (after being sick).
'boss' with its last letter taken away is 'bos'.
'bos' anagrammed gives 'obs'.
'obs'+'cured'='OBSCURED'
'from' acts as a link.
(Other definitions for obscured that I've seen before include "Overshadowed or eclipsed" , "kept out of sight" , "Good news from clinic about schoolboy no longer" , "Veiled, hidden" , "unnoticed" .)