Bath time barney (4)
I believe the answer is:
spat
'bath time barney' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'bath time' is the wordplay.
'bath' becomes 'spa' (I've seen this before).
'time' becomes 't'.
'spa'+'t'='SPAT'
Can you help me to learn more?
(Other definitions for spat that I've seen before include "Taps in a small quarrel" , "Row; discharged" , "Little quarrel - leg wear" , "Pat's involved in petty quarrel" , "Slight quarrel - ejected saliva" .)