Throw about rum that's cheap and nasty (6)
I believe the answer is:
shoddy
'cheap and nasty' is the definition.
(I've seen this before)
'throw about rum' is the wordplay.
'throw' becomes 'shy' (shy is a kind of throw).
'about' indicates putting letters inside.
'rum' becomes 'odd' (rum can mean strange or dubious).
'shy' placed around 'odd' is 'SHODDY'.
'that's' acts as a link.
(Other definitions for shoddy that I've seen before include "Kind of worsted" , "Badly engineered" , "Slapdash" , "Of inferior workmanship" , "Gimcrack" .)