French underground force soldiers repelled (5)
I believe the answer is:
metro
'french underground' is the definition.
(I've seen this before)
'force soldiers repelled' is the wordplay.
'force' becomes 'met' (I've seen this in other clues).
'soldiers' becomes 'OR' (Other Ranks).
'repelled' shows that the letters should be reversed in order.
'or' back-to-front is 'ro'.
'met'+'ro'='METRO'
(Other definitions for metro that I've seen before include "Parisian underground system" , "what moves many Parisians" , "Parisian underground railway" , "Paris underground rail system" , "The Paris Underground transport system" .)