Tell Romeo story in reverse, with end at the start (6)
I believe the answer is:
relate
'tell' is the definition.
(as in to tell or relate a story)
'romeo story in reverse with end at the start' is the wordplay.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'story' becomes 'tale' (synonyms).
'in reverse' shows that the letters should be reversed in order.
'with' says to put letters next to each other.
'at the start' says to take the initial letters.
The first letter of 'end' is 'e'.
'tale' written backwards gives 'elat'.
'r'+'elat'+'e'='RELATE'
(Other definitions for relate that I've seen before include "Make a logical or causal connection" , "Narrate or associate" , "Empathise" , "Show a connection between (things)" , "Recount" .)