Golf learner at first using English stick (4)
I believe the answer is:
glue
'stick' is the definition.
(to stick with glue)
'golf learner at first using english' is the wordplay.
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'at' is a charade indicator (letters next to each other).
'first using' becomes 'u' (1st letter of 'using').
'english' becomes 'E' (abbreviation as in OED).
'g'+'l'+'u'+'e'='GLUE'
(Other definitions for glue that I've seen before include "Fixative" , "Sticky substance" , "Stuff that sticks firmly" , "Stick together" , "agent with sticking power" .)