Go on notice, front circle is vacant (7)
I believe the answer is:
advance
'go on' is the definition.
(synonyms)
'notice front circle is vacant' is the wordplay.
'notice' becomes 'ad' (short for advert).
'front' becomes 'van' (I've seen this in other clues).
'is vacant' says to hollow out the word (remove centre letters) (a vacant or emptied out form of the word).
'circle' with its middle removed is 'ce'.
'ad'+'van'+'ce'='ADVANCE'
(Other definitions for advance that I've seen before include "Forward - loan - increase" , "Bring forward" , "Move ahead" , "Suggest" , "Move forward like army or loan against wage" .)