Crashed bus brought in by worker's partner (7)
I believe the answer is:
husband
'partner' is the definition.
(I know that husband is a type of partner)
'crashed bus brought in by worker's' is the wordplay.
'crashed' indicates an anagram.
'brought in by' means one lot of letters goes inside another.
'worker' becomes 'hand' (hand is a kind of worker).
'bus' with letters rearranged gives 'usb'.
'usb' going into 'hand' is 'HUSBAND'.
(Other definitions for husband that I've seen before include "Groom" , "M arried man" , "Partner in marriage" , "Conserve" , "Male relative" .)