Hang about, that is intimate stuff (8)
I believe the answer is:
lingerie
'intimate stuff' is the definition.
'hang about that is' is the wordplay.
'hang about' becomes 'linger' (I've seen this before).
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'linger'+'ie'='LINGERIE'
(Other definitions for lingerie that I've seen before include "flimsy stuff" , "Women's underwear and nightclothes" , "Slinky undergarments" , "Scanties" , "frillies" .)