Cross-party reps' work adding nothing in further statement (5)
I believe the answer is:
oppos
'cross-party reps' work adding' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'nothing in further statement' is the wordplay.
'nothing' becomes 'o' (O resembles 0).
'in' is an insertion indicator.
'further' becomes 'op' (I can't justify this - if you can you should give a lot more credence to this answer).
'statement' becomes 'PS' (PS is an example).
'op'+'ps'='opps'
'o' going into 'opps' is 'OPPOS'.
Can you help me to learn more?
(Other definitions for oppos that I've seen before include "colleagues elsewhere" , "Partners" , "friends" , "One's counterparts" .)