### Clue: Embarrassed around naked milf (also hot under collar) (5)
### Answer: RILED 
 ### Explanation: Definition: hot under collar
 RED(embarrassed as evidenced by one's complexion) **containing**(around) "milf" **minus its 1st and last letters**(naked …).
The acronym MILF (a very tame version is "yummy mummy") was new to me, but it fits perfectly the surface of the clue..