Some hairdresser giddily brought back stray (7)
I believe the answer is:
digress
'stray' is the definition.
(I know that stray can be written as digress)
'some hairdresser giddily brought back' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'brought back' says the letters should be written in reverse.
'ssergid' is hidden within 'hairdresser giddily'.
'ssergid' backwards is 'DIGRESS'.
(Other definitions for digress that I've seen before include "Deviate from the main subject" , "Wander from subject" , "Get off the point" , "Go off topic" , "Turn aside (from the main subject?)" .)