Get on a bit maybe (6)
I believe the answer is:
obtain
'get' is the definition.
(I know that get can be written as obtain)
'on a bit maybe' is the wordplay.
'maybe' indicates an anagram.
'on'+'a'+'bit'='onabit'
'onabit' with letters rearranged gives 'OBTAIN'.
(Other definitions for obtain that I've seen before include "Get or receive" , "Come into possession of" , "Hold good" , "Gain possession of" , "Take possession of" .)