Pride on being included in roster? Not quite (5)
I believe the answer is:
lions
'pride' is the definition.
(a pride is a group of lions)
'on being included in roster? not quite' is the wordplay.
'being included in' indicates putting letters inside.
'roster?' becomes 'list' (roster is a kind of list).
'not quite' means to remove the last letter.
'list' with its last letter taken away is 'lis'.
'on' inserted into 'lis' is 'LIONS'.
(Other definitions for lions that I've seen before include "Wild cats" , "Big cats" , "Kings of the jungle" , "Large carnivores" , "Cats living in prides" .)