Hold on a bit, excited (6)
I believe the answer is:
obtain
'hold' is the definition.
('obtain' can be a synonym of 'hold')
'on a bit excited' is the wordplay.
'excited' indicates an anagram.
'on'+'a'+'bit'='onabit'
'onabit' is an anagram of 'OBTAIN'.
(Other definitions for obtain that I've seen before include "Get - secure" , "Acquire or procure" , "Get, procure" , "'Get, acquire (6)'" , "Get or receive" .)