Gift opened by the scoundrel, one for Gordon Bennett (11)
I believe the answer is:
botheration
'gordon bennett' is the definition.
(both are expressions used to show exasperation)
'gift opened by the scoundrel one' is the wordplay.
'gift' becomes 'boon' (I've seen this before**).
'opened by' indicates putting letters inside (one word creates an opening in another word).
'scoundrel' becomes 'rat' (I've seen this in other clues).
'one' becomes 'i' (Roman numeral).
'the'+'rat'+'i'='therati'
'boon' placed around 'therati' is 'BOTHERATION'.
'for' acts as a link.
(Other definitions for botheration that I've seen before include "Worry - darn it!" , "drat it!" , "dammit!" .)