Murphy, for instance, has a right to public transport (5)
I believe the answer is:
tuber
'murphy for instance' is the definition.
I can't judge whether this defines the answer.
'a right to public transport' is the wordplay.
'a right' becomes 'R' (common abbreviation).
'to' means one lot of letters go next to another (I've seen this in other clues).
'public transport' becomes 'tube' (the London Underground is nicknamed the Tube. I am not sure about the 'public' bit.).
'r' put after 'tube' is 'TUBER'.
'has' is the link.
Can you help me to learn more?
(Other definitions for tuber that I've seen before include "A brute of a spud" , "Thickened underground stem" , "Type of plant, potato say" , "Underground stem, root" , "Fleshy root, vegetable say" .)