Part of Twickenham where a try is only a start (5)
I believe the answer is:
entry
'a start' is the definition.
(entry is a kind of start)
'part of twickenham where a try is only' is the wordplay.
I cannot quite see how this works, but
'a try' could be 'try' and 'try' is located in the answer.
The remaining letters 'en' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for entry that I've seen before include "Item inserted in a written record" , "List of candidates" , "Item in an account book" , "Competitor" , "Opening" .)