Stick poster in this location (6)
I believe the answer is:
adhere
'stick' is the definition.
(to adhere to something is to stick to it)
'poster in this location' is the wordplay.
'poster' becomes 'ad' (short for advert).
'in this location' becomes 'here' (I've seen this in another clue).
'ad'+'here'='ADHERE'
(Other definitions for adhere that I've seen before include "Stick to or continue faithful" , "Stick to or remain faithful" , "Stick or cleave to" , "Stick to, cling" , "Stick fast (to something)" .)