Get on a bit frenetically (6)
I believe the answer is:
obtain
'get' is the definition.
(I know that get can be written as obtain)
'on a bit frenetically' is the wordplay.
'frenetically' is an anagram indicator (I've seen this in other clues).
'on'+'a'+'bit'='onabit'
'onabit' is an anagram of 'OBTAIN'.
(Other definitions for obtain that I've seen before include "Come into possession of" , "'Get, acquire (6)'" , "Acquire or procure" , "Gain possession of" , "Hold good" .)