Mad that father and I can’t travel together (7)
I believe the answer is:
frantic
'mad' is the definition.
('frantic' can be a synonym of 'mad')
'father and i can't travel together' is the wordplay.
I cannot quite see how this works, but
'father' could be 'fra' and 'fra' is found in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is located in the answer.
'i' is found in the answer.
This explanation may well be incorrect...
'that' is the link.
Can you help me to learn more?
(Other definitions for frantic that I've seen before include "Wild - frenzied" , "Overwrought" , "Wildly agitated" , "Distracted" , "Desperate with worry" .)