Song performed by little Sarah in the afternoon (5)
I believe the answer is:
psalm
'song' is the definition.
(I've seen this before)
'little sarah in the afternoon' is the wordplay.
'little' means to remove the last letter (the word is not quite complete).
'sarah' becomes 'Sall' (Sally is a common pet form of Sarah).
'in the' means one lot of letters goes inside another.
'afternoon' becomes 'pm'.
'sall' with its last letter removed is 'sal'.
'sal' going inside 'pm' is 'PSALM'.
'performed by' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for psalm that I've seen before include "Sacred Biblical song" , "Sacred song from Old Testament" , "Song of David" , "Old Testament hymn" , "OT song" .)