Share question on team regularly (5)
I believe the answer is:
quota
'share' is the definition.
(quota is a kind of share)
'question on team regularly' is the wordplay.
'question' becomes 'qu'.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'on'+'team'='onteam'
The alternating letters of 'onteam' are 'ota'.
'qu'+'ota'='QUOTA'
(Other definitions for quota that I've seen before include "Assigned part" , "Apportionment" , "certain allowance" , "Share to which one is entitled" , "Proportional share" .)