It's short and snappy (5)
I believe the answer is:
photo
'it's short and snappy' is the definition.
I can't judge whether this definition defines the answer.
'it's short and' is the wordplay.
'it's' becomes 'pho' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'short' means to remove the last letter.
'and' becomes 'too'.
'too' with its last letter removed is 'to'.
'pho'+'to'='PHOTO'
Can you help me to learn more?
(Other definitions for photo that I've seen before include "In brief, a snapshot" , "Picture (abbr)" , "Snap (abbrev.)" , "Snap, exposure, in short" , "Pic (abbr)" .)