I make the mistake of taking tea round to the entertainer (7)
I believe the answer is:
pierrot
'the entertainer' is the definition.
(stock theatrical character)
'i make the mistake of taking tea round' is the wordplay.
I cannot quite see how this works, but
'i' is present in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
'mistake' could be 'err' (to err is to make a mistake or blunder) and 'err' is located in the answer.
'of' could be 'o' and 'o' is found in the answer.
A single letter 'p' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
'to' is the link.
Can you help me to learn more?
(Other definitions for pierrot that I've seen before include "French pantomime character with a white face" , "I report on French pantomime clown" , "Male clown from French pantomime" , "Clown from French pantomime with white face and costume - tripe or what?" , "Period; incantation" .)