A top mobster kidnaps even members of public in Pacific resort (8)
I believe the answer is:
acapulco
'pacific resort' is the definition.
(I've seen this before)
'a top mobster kidnaps even members of public' is the wordplay.
'top mobster' becomes 'capo' (senior mafia member).
'kidnaps' is an insertion indicator (I've seen this in other clues).
'even members of' indicates alternate letters (letters in even-numbered positions are used).
The alternate letters of 'public' are 'ulc'.
'capo' placed around 'ulc' is 'capulco'.
'a'+'capulco'='ACAPULCO'
'in' acts as a link.
(Other definitions for acapulco that I've seen before include "Mexico port, resort" , "Fashionable resort city in southern Mexico" , "Mexican city" , "Mexican Pacific seaside resort" , "Mexican location" .)