Roundabout very like one's stuck in the night before (7)
I believe the answer is:
evasive
'roundabout' is the definition.
(thesaurus)
'very like one's stuck in the night before' is the wordplay.
'very' becomes 'v' (abbreviation).
'like' becomes 'as'.
'one' becomes 'i' (Roman numeral).
'stuck in' is an insertion indicator.
'the night before' becomes 'eve' (I've seen this in another clue).
'v'+'as'+'i'='vasi'
'vasi' going inside 'eve' is 'EVASIVE'.
(Other definitions for evasive that I've seen before include "Shifty; equivocating" , "Devious" , "Deliberately vague" , "Quibbling" , "Shifty, slippery" .)