World War II hero ordered to join resistance (5)
I believe the answer is:
bader
'world war ii hero' is the definition.
(I've seen this before)
'ordered to join resistance' is the wordplay.
'ordered' becomes 'bade' (past tense of 'bid' as in to order).
'to join' means one lot of letters go next to another.
'resistance' becomes 'r' (electronics abbreviation).
'bade'+'r'='BADER'
(Other definitions for bader that I've seen before include "Douglas --, WW2 hero" , "Disabled Battle of Britain flying ace" , "Sir Douglas ---, WWII hero" , "was famously legless" , "World War II hero" .)