A character in Sheridan's play said to be coming (7)
I believe the answer is:
arrival
'be coming' is the definition.
(I've seen this in another clue)
'a character in sheridan's play' is the wordplay.
'character' becomes 'r'.
'in' means one lot of letters goes inside another.
'sheridan's play' becomes 'rival' (I can't explain this - if you can you should believe this answer much more).
'r' put inside 'rival' is 'rrival'.
'a'+'rrival'='ARRIVAL'
'said to' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for arrival that I've seen before include "Act of coming" , "The A in ETA" , "Entry" , "Coming - comer" , "Appearance, entrance" .)