Boastful fixing end component where screwdriver may be had? (8,5)

'where screwdriver may be had?' is the definition.
(screwdriver is a type of cocktail)

'boastful fixing end component' is the wordplay.
I cannot quite understand how this works, but
'end' could be 'tail' (tail is a kind of end) and 'tail' is found in the answer.
'component' could be 'part' (I've seen this before) and 'part' is found in the answer.
'boastful' could be 'cocky' (cocky means boastful or arrogant) and 'cocky' is present in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...