Is very nervous of locks (6)
I believe the answer is:
dreads
I believe this clue is a double definition.
'is very nervous' is the first definition.
(to dread something is to be very nervous about it)
'locks' is the second definition.
(short for dreadlocks)
'of' is the link.
(Other definitions for dreads that I've seen before include "Sadder (anag)" , "Is in great fear of" , "Worries about" , "Looks ahead with apprehension" , "Strongly fears" .)