Intimidate learner in loose hood (4)
I believe the answer is:
cowl
'loose hood' is the definition.
(I've seen this before)
'intimidate learner' is the wordplay.
'intimidate' becomes 'cow' (cow can mean to bully or intimidate).
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'cow'+'l'='COWL'
'in' acts as a link.
(Other definitions for cowl that I've seen before include "form of protection?" , "Dried fruit" , "Hood for monk or chimney" , "Monk's hood or chimney covering" , "Cover for monk or chimney" .)