Republican wearing skimpy beachwear generates crowd (6)
I believe the answer is:
throng
'crowd' is the definition.
(I know that throng has the is a more specific form of the action crowd)
'republican wearing skimpy beachwear' is the wordplay.
'republican' becomes 'R' (abbreviation in US politics).
'wearing' means one lot of letters goes inside another.
'skimpy beachwear' becomes 'thong' (I've seen this in another clue).
'r' placed inside 'thong' is 'THRONG'.
'generates' acts as a link.
(Other definitions for throng that I've seen before include "Pack" , "Dense crowd" , "Large gathering of people" , "Large densely-packed crowd" , "Milling crowd" .)