Saw stuff stored in electronic memory (7)
I believe the answer is:
epigram
'saw' is the definition.
(thesaurus)
'stuff stored in electronic memory' is the wordplay.
'stuff' becomes 'pig' (both can mean to eat lots of food).
'stored in' is an insertion indicator.
'electronic' becomes 'e' (as in e-mail or e-books).
'memory' becomes 'ram' (RAM is an example).
'e'+'ram'='eram'
'pig' placed into 'eram' is 'EPIGRAM'.
(Other definitions for epigram that I've seen before include "Witty poem" , "Pithy and witty saying" , "Short witty remark" , "Witticism - adage" , "Concise witty saying" .)