Repeats expression of hesitation over headwear (6)
I believe the answer is:
recaps
'repeats' is the definition.
'expression of hesitation over headwear' is the wordplay.
'expression of hesitation' becomes 'er'.
'over' says the letters should be written backwards.
'headwear' becomes 'caps'.
'er' backwards is 're'.
're'+'caps'='RECAPS'
(Other definitions for recaps that I've seen before include "Such summaries" , "Summarises briefly" , "In brief, state again the main points" , "Summarises at the end" , "Reviews" .)