Instant record of events showing offhand heavy drinker grabbing husband (8)
I believe the answer is:
snapshot
'instant record of events showing offhand' is the definition.
I can't tell whether this definition defines the answer.
'heavy drinker grabbing husband' is the wordplay.
'heavy' becomes 'snap' (I can't explain this - if you can you should give a lot more credence to this answer).
'drinker' becomes 'sot' (sot is a kind of drinker).
'grabbing' means one lot of letters goes inside another.
'husband' becomes 'h'.
'sot' enclosing 'h' is 'shot'.
'snap'+'shot'='SNAPSHOT'
Can you help me to learn more?
(Other definitions for snapshot that I've seen before include "Bit of camerawork" , "Informal photo" , "Quick photo" , "Casual photograph" , "Instant record of an event" .)