### Clue: Be obliged to admit fellow sent north is on the tail of Red Guard (6)
### Answer: DEFEND 
 ### Explanation: Definition: Guard
 **Reversal of**(… sent north, in a down clue) [ NEED(be obliged to do something, as in "you don't need to attend") **containing**(to admit) F(abbrev. for "fellow") ] **placed above**(is on, in a down clue) **the last letter of**(the tail of) "Red".
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