A busy day going round temples primarily to see their most sacred parts (5)
I believe the answer is:
adyta
'see their most sacred parts' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'a busy day going round temples primarily' is the wordplay.
'busy' is an anagram indicator.
'going round' means one lot of letters goes inside another (some letters go around others).
'primarily' says to take the initial letters.
The first letter of 'temples' is 't'.
'day' with letters rearranged gives 'dya'.
'dya' enclosing 't' is 'dyta'.
'a'+'dyta'='ADYTA'
'to' acts as a link.
Can you help me to learn more?
(Another definition for adyta that I've seen is " private rooms".)