Partner’s arguments against leading to nought, right? (7)
I believe the answer is:
consort
'partner's' is the definition.
(synonyms)
'arguments against leading to nought right?' is the wordplay.
'arguments against' becomes 'cons' (I've seen this in another clue).
'leading to' means one lot of letters go next to another (some letters go before or lead others).
'nought' becomes 'O' (O resembles 0).
'right?' becomes 'rt' (abbreviation as in Rt Hon- the Right Honourable).
'cons'+'o'+'rt'='CONSORT'
(Other definitions for consort that I've seen before include "Husband or wife of a monarch" , "Marriage partner" , "Group playing music" , "Companion; ship sailing with another" , "Keep company" .)