Makes about turn in direction of festival (6)
I believe the answer is:
easter
'festival' is the definition.
(Christian festival)
'makes about turn in direction' is the wordplay.
'makes about' becomes 'ease' (I can't justify this - if you can you should give a lot more credence to this answer).
'turn' becomes 't' (abbreviation in Oxford Dictionary of Abbreviations).
'in' indicates putting letters inside.
'direction' becomes 'r' (r is abbreviation for right).
'ease' enclosing 't' is 'easte'.
'easte'+'r'='EASTER'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for easter that I've seen before include "Monday of 1916 Rising" , "Festival after Lent" , "A steer (anag.)" , "Egg-rolling time" , "Time to celebrate" .)