Photograph cracks (8)
I believe the answer is:
snapshot
'photograph cracks' is the definition.
'snapshot' can be an answer for 'photograph' (I've seen this before). I'm unsure of the 'cracks' bit.
'photograph cracks' is the wordplay.
'photograph' becomes 'snap' (synonyms).
'cracks' becomes 'shot' (I am not sure about this - if you are sure you should believe this answer much more).
'snap'+'shot'='SNAPSHOT'
Can you help me to learn more?
(Other definitions for snapshot that I've seen before include "Pan hosts over casual photo" , "pic" , "print" , "still taken quickly" , "Instant record of an event" .)