Fear rugby players in Barnet? (10)
I believe the answer is:
dreadlocks
'barnet?' is the definition.
(dreadlocks is a type of hair or 'barnet')
'fear rugby players' is the wordplay.
'fear' becomes 'dread' (dread is a kind of fear).
'rugby players' becomes 'locks' (lock is a type of rugby player).
'dread'+'locks'='DREADLOCKS'
'in' is the link.
(Other definitions for dreadlocks that I've seen before include "great shock" , "Rastafarian hairstyle" , "Barnet" , "Jamaican hairstyle" , "Put hair in these" .)