Block that is restricting male flow (7)
I believe the answer is:
impasse
'block' is the definition.
(I've seen this before)
'that is restricting male flow' is the wordplay.
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'restricting' is an insertion indicator.
'male' becomes 'm' (common abbreviation).
'flow' becomes 'pass' (I can't explain this - if you can you should believe this answer much more).
'm'+'pass'='mpass'
'ie' enclosing 'mpass' is 'IMPASSE'.
Can you help me to learn more?
(Other definitions for impasse that I've seen before include "Situation in which no progress can be made" , "Stand-off, stalemate" , "Deadlock or stand-off" , "No progress is possible in this type of situation" , "Stalemate situation" .)