Dutch humanist from period with revolutionary problems (7)
I believe the answer is:
erasmus
'dutch humanist' is the definition.
(I've seen this before)
'period with revolutionary problems' is the wordplay.
'period' becomes 'era' (era is a kind of period).
'with' is a charade indicator (letters next to each other).
'revolutionary' is a reversal indicator.
'problems' becomes 'sums' (arithmetic problems).
'sums' back-to-front is 'smus'.
'era'+'smus'='ERASMUS'
'from' is the link.
(Other definitions for erasmus that I've seen before include "Dutch philosopher" , "He praised folly" , "Learned person" , "Desiderius -, Dutch scholar, humanist" , "Humanist critical of Church" .)