Trains heading for Euston with fees to carry pet (8)
I believe the answer is:
educates
'trains' is the definition.
(I know this)
'heading for euston with fees to carry pet' is the wordplay.
'heading for' says to take the initial letters.
'with' says to put letters next to each other.
'fees' becomes 'dues' (payments which are due).
'to carry' indicates putting letters inside.
'pet' becomes 'cat' (I have seen 'Common pet ' mean 'cat' so perhaps 'pet' could also mean 'cat').
The initial letter of 'euston' is 'e'.
'dues' enclosing 'cat' is 'ducates'.
'e'+'ducates'='EDUCATES'
(Other definitions for educates that I've seen before include "Trains the mind and abilities" , "Trains, teaches" , "Instructs, teaches" .)