Fastener caught wedged in piece of wood (5)
I believe the answer is:
latch
'fastener' is the definition.
(latch is a kind of fastener)
'caught wedged in piece of wood' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'wedged in' indicates putting letters inside.
'piece of wood' becomes 'lath' (I can't justify this - if you can you should believe this answer much more).
'c' placed within 'lath' is 'LATCH'.
Can you help me to learn more?
(Other definitions for latch that I've seen before include "closer" , "Fastening for door or window" , "Device for opening door" , "Light door lock" , "Small bar for fastening a door" .)