A short period of enchantment (5)
I believe the answer is:
spell
This clue is a double definition.
'a short period' is the first definition.
(I've seen this before)
'enchantment' is the second definition.
(synonyms)
'of' acts as a link.
(Other definitions for spell that I've seen before include "Period of time - bewitching utterance" , "Short time, splinter" , "Period (of enchantment?)" , "... mean" , "Period (of work); incantation" .)