Person entertained during contest drinking tea, mostly (7)

'person entertained' is the definition.
I can't tell whether this defines the answer.

'during contest drinking tea mostly' is the wordplay.
'during' becomes 'in' (e.g. during February means in February).
'contest' becomes 'vie' (both can mean to rival or fight).
'drinking' means one lot of letters goes inside another (inserted letters are consumed or drunk).
'mostly' means to remove the last letter (most but not all of the word).
'tea' with its final letter taken off is 'te'.
'vie' going around 'te' is 'vitee'.
'in'+'vitee'='INVITEE'

Can you help me to learn more?