Silly section of refrain, an embarrassment (5)
I believe the answer is:
inane
'silly' is the definition.
(thesaurus)
'section of refrain an embarrassment' is the wordplay.
'section of' indicates the answer is hidden within the clue.
'INANE' is hidden within 'refrain an embarrassment'.
(Other definitions for inane that I've seen before include "Moronic" , "Lacking sense, silly" , "Puerile" , "Foolish, silly" , "Witless and pointless" .)