Father has learner as friend (3)
I believe the answer is:
pal
'friend' is the definition.
(pal can mean a friend)
'father has learner' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'has' is a charade indicator (letters next to each other).
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'pa'+'l'='PAL'
'as' acts as a link.
(Other definitions for pal that I've seen before include "Mate, buddy" , "Mate, informal friend" , "Friend (colloq.)" , "Bud" , "China" .)