Stick plug at this point (6)
I believe the answer is:
adhere
'stick' is the definition.
('adhere' can be a synonym of 'stick')
'plug at this point' is the wordplay.
'plug' becomes 'ad' (Advertisement plugs products).
'at this point' becomes 'here' (I've seen this before).
'ad'+'here'='ADHERE'
(Other definitions for adhere that I've seen before include "Stick like a stamp" , "Stick or cleave to" , "Bond" , "Stick - join" , "Stick L" .)