Underground resistance interrupts feminist movement briefly (5)
I believe the answer is:
metro
'underground' is the definition.
(I know that underground can be written as metro)
'resistance interrupts feminist movement briefly' is the wordplay.
'resistance' becomes 'r' (electronics abbreviation).
'interrupts' means one lot of letters goes inside another.
'feminist movement' becomes 'MeToo' (the Me Too movement).
'briefly' means to remove the last letter.
'metoo' with its last letter taken off is 'meto'.
'r' going within 'meto' is 'METRO'.
(Other definitions for metro that I've seen before include "Urban railway system" , "Paris underground rail system" , "what moves many Parisians" , "The underground railway system in Paris" , "Paris subway" .)