Father, by the end, on phone to leader's car (10)

'leader's car' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'father by the end on phone' is the wordplay.
'father by' becomes 'pop' (pop is a kind of father. I am not sure about the 'by' bit.).
'end' suggests the final letters.
'on' means one lot of letters go next to another.
'phone' becomes 'mobile phone' (mobile phone).
The last letter of 'the' is 'e'.
'pop'+'e'+'mobile'='POPEMOBILE'

'to' is the link.

Can you help me to learn more?