Rugby team is no more, I should add (5)
I believe the answer is:
wasps
'rugby team' is the definition.
(Wasps Rugby Football Club)
'is no more i should add' is the wordplay.
'is no more' becomes 'was' ('was' is the past tense form of 'is').
'i should add' becomes 'ps' (as in a PS in a letter).
'was'+'ps'='WASPS'
(Other definitions for wasps that I've seen before include "Striped stinging insects" , "Rugby club" , "Stinging hymenopterans" , "English Protestant stingers?" , "Ones playing together" .)