Bolt vegetables once peeled (5)
I believe the answer is:
arrow
'bolt' is the definition.
(I've seen this before)
'vegetables once peeled' is the wordplay.
'vegetables' becomes 'marrows' (marrow is a kind of vegetable).
'once peeled' means to look at the middle letters (outside letters are peeled off).
The central letters of 'marrows' are 'ARROW'.
(Other definitions for arrow that I've seen before include "Direction pointer" , "Missile fired from bow" , "Pointed weapon" , "The bowman's missile" , "pointer to the way forward" .)