With directions, he can possibly improve (7)
I believe the answer is:
enhance
'improve' is the definition.
(I know that enhance is a more specific form of improve)
'with directions he can possibly' is the wordplay.
'with' is an insertion indicator.
'directions' becomes 'en' (east and north).
'possibly' indicates anagramming the letters.
'he'+'can'='hecan'
'hecan' anagrammed gives 'hance'.
'en' going into 'hance' is 'ENHANCE'.
(Other definitions for enhance that I've seen before include "Boost" , "improve things" , "Increase in power" , "Improve the quality of (something)" , "To improve matters" .)