As worn by the dominant partner? (8)
I believe the answer is:
trousers
'as worn by the dominant partner?' is the definition.
I can't tell whether this defines the answer.
'by the dominant partner?' is the wordplay.
'by' means one lot of letters go next to another.
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'dominant' becomes 'rouser' (I can't justify this - if you can you should give a lot more credence to this answer).
'partner?' becomes 's'.
't' next to 'rouser' is 'trouser'.
'trouser'+'s'='TROUSERS'
Can you help me to learn more?
(Other definitions for trousers that I've seen before include "Bags" , "Slacks" , "Garment (worn by the one in control?)" , "Longs" , "Leg coverings" .)