In centre it's flipping hot (6)
I believe the answer is:
erotic
'hot' is the definition.
(both can mean sexy or sexual)
'in centre it's flipping' is the wordplay.
'in' means one lot of letters goes inside another.
'centre' becomes 'core' (core can mean something's centre).
'flipping' shows that the letters should be reversed in order.
'core' going around 'it' is 'citore'.
'citore' in reverse letter order is 'EROTIC'.
(Other definitions for erotic that I've seen before include "Steamy" , "Sexy" , "Titillating" , "stimulating" , "Intended to arouse" .)