Shot photo sent immediately (2,3,4)
I believe the answer is:
on the spot
'immediately' is the definition.
(I've seen this before)
'shot photo sent' is the wordplay.
'shot' is an anagram indicator.
'photo'+'sent'='photosent'
'photosent' anagrammed gives 'ON-THE-SPOT'.
(Other definitions for on the spot that I've seen before include "Apply ointment here" , "In a difficult position, forced to decide" , "Where acne cream applied" , "In an awkward predicament" , "Snooker balls may be" .)