Stick promo in this place (6)
I believe the answer is:
adhere
'stick' is the definition.
(to adhere to something is to stick to it)
'promo in this place' is the wordplay.
'promo' becomes 'ad' (I can't justify this - if you can you should give a lot more credence to this answer).
'in this place' becomes 'here' (synonyms).
'ad'+'here'='ADHERE'
Can you help me to learn more?
(Other definitions for adhere that I've seen before include "paste" , "Stick L" , "Stick firmly" , "Stick - join" , "Hold fast, stand by" .)