Sink was given nasty bash at home (9)
I believe the answer is:
washbasin
'sink' is the definition.
(I know that sink can be written as washbasin)
'was given nasty bash at home' is the wordplay.
'given' is an insertion indicator.
'nasty' is an anagram indicator (a nasty or wrong spelling).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'bash' anagrammed gives 'shba'.
'was' going around 'shba' is 'washbas'.
'washbas'+'in'='WASHBASIN'
(Other definitions for washbasin that I've seen before include "Bathroom fixture" , "Shallow sink" , "Ablutions bowl" , "home bathroom fitting?" .)