Stick advertisement in this place (6)
I believe the answer is:
adhere
'stick' is the definition.
('adhere' can be a synonym of 'stick')
'advertisement in this place' is the wordplay.
'advertisement' becomes 'ad' ('ad' can be a synonym of 'advertisement').
'in this place' becomes 'here' ('here' can be a synonym of 'in this place').
'ad'+'here'='ADHERE'
(Other definitions for adhere that I've seen before include "secure" , "Stay attached" , "Stick to - cement" , "Stick like a stamp" , "Bond" .)