Item to assist washing behind ears trialled initially under offer (5)
I believe the answer is:
bidet
'item to assist washing behind' is the definition.
I can't tell whether this definition defines the answer.
'ears trialled initially under offer' is the wordplay.
'initially' says to take the initial letters.
'under' means one lot of letters go next to another (below, in a down clue).
'offer' becomes 'bid' (bid is a kind of offer).
The first letters of 'ears trialled' is 'et'.
'et' put after 'bid' is 'BIDET'.
Can you help me to learn more?
(Other definitions for bidet that I've seen before include "Low basin for washing private parts" , "Bathroom feature" , "Type of basin" , "Bathroom facility" , "Bathroom appliance" .)