Renounce Me generation in part, taken aback (6)
I believe the answer is:
renege
'renounce' is the definition.
(I've seen this before)
'me generation in part taken aback' is the wordplay.
'in part' indicates the answer is hidden within the clue.
'taken aback' shows that the letters should be reversed in order.
'egener' is hidden within 'me generation'.
'egener' in reverse letter order is 'RENEGE'.
(Other definitions for renege that I've seen before include "Withdraw" , "Fail to keep promise, or revoke in cards" , "Default" , "Deny or renounce" , "Fail to honour an obligation" .)