Squiffy fools rolling over floor (6)
I believe the answer is:
stinko
'squiffy' is the definition.
(thesaurus)
'fools rolling over floor' is the wordplay.
'fools' becomes 'nits' (I've seen this before).
'rolling over' is a reversal indicator.
'floor' becomes 'ko' (I've seen this in other clues).
'nits' back-to-front is 'stin'.
'stin'+'ko'='STINKO'
(Other definitions for stinko that I've seen before include "Drunk" , "one over the eight?" , "Tight" , "worse for wear" .)