British Rail has something to do with this part of a plant (5)
I believe the answer is:
bract
'a plant' is the definition.
The answer is an example.
'british rail has something to do with this part' is the wordplay.
'british rail' becomes 'br'.
'has' is a charade indicator (letters next to each other).
'something to do' becomes 'ac' (I can't explain this - if you can you should believe this answer much more).
'with' means one lot of letters go next to another.
'part' suggests taking the first letters.
The initial letter of 'this' is 't'.
'br'+'ac'+'t'='BRACT'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for bract that I've seen before include "Small scale" , "Flower-bearing leaf" , "Leaf-like part of plant" , "Type of leaf" .)