Stick to half the road in this place (6)
I believe the answer is:
adhere
'stick to' is the definition.
(synonyms)
'half the road in this place' is the wordplay.
'half the' means to take half the letters.
'in this place' becomes 'here' (synonyms).
'road' with half the letters taken is 'ad'.
'ad'+'here'='ADHERE'
(Other definitions for adhere that I've seen before include "Stick fast (to something)" , "Stick - join" , "Stick firmly" , "Stay attached" , "Remain attached" .)