Entertainer turning up at party, initially with tower of presents (3,6)
I believe the answer is:
Here is my best explanation:
'entertainer' is the definition.
(tap dancer is a kind of entertainer)
'turning up at party initially with tower of presents' is the wordplay.
'turning up' says the letters should be written in reverse.
'initially' indicates taking the first letters.
'with' is a charade indicator (letters next to each other).
'tower of presents' becomes 'dancer' (name of a reindeer said to tow Santa's sleigh).
The initial letter of 'party' is 'p'.
'at' back-to-front is 'ta'.