Bolt as large chat went wrong (5)
I believe the answer is:
latch
'bolt' is the definition.
(I know that bolt can be written as latch)
'as large chat went wrong' is the wordplay.
'large' becomes 'lg' (abbreviation).
'chat' becomes 'gas' (informal term meaning to chat).
'went' is a deletion indicator (selected letters go away).
'wrong' becomes 'atch' (I can't explain this - if you can you should believe this answer much more).
'as'+'lg'='aslg'
'aslg' with 'gas' removed is 'l'.
'l'+'atch'='LATCH'
Can you help me to learn more?
(Other definitions for latch that I've seen before include "Device for opening door" , "Gate fastener" , "closer" , "Fastening for door or window" , "Small bar for fastening a door" .)