Seeking explanation for not just any old revolt (10)
I believe the answer is:
theorising
'seeking explanation' is the definition.
'not just any old revolt' is the wordplay.
'not just any' becomes 'the' (I've seen this in another clue).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'revolt' becomes 'rising' (synonyms).
'the'+'o'+'rising'='THEORISING'
'for' is the link.
(Other definitions for theorising that I've seen before include "In speculative activity" , "indulging in speculation" , "coming up with ideas?" .)