Clue: Suggestion to ditch leader unfortunately blocked by eccentric toff with the ability to speak unknown languages (4,2,7)
Answer: GIFT OF TONGUES
Explanation: Definition: the ability to speak unknown languages

***(uggestion)** [anag:*unfortunately*] *blocked by* ***(toff)** [anag:*eccentric*] where UGGESTION is (s)UGGESTION with its "leader ditched"