Fellows escorted revolutionary Austrian scientist (6)
I believe the answer is:
mendel
'austrian scientist' is the definition.
'Mendel' can be an answer for 'scientist' (Mendel is an example). I am not certain of the 'austrian' bit.
'fellows escorted revolutionary' is the wordplay.
'fellows' becomes 'men' (I've seen this before).
'escorted' becomes 'led'.
'revolutionary' says the letters should be written backwards.
'led' in reverse letter order is 'del'.
'men'+'del'='MENDEL'
Can you help me to learn more?
(Other definitions for mendel that I've seen before include "Austrian monk and geneticist" , "Scientific monk; lend me (anag.)" , "heredity expert" .)