Board game for science crowd (8)
I believe the answer is:
scrabble
'board game' is the definition.
(I've seen this in another clue)
'science crowd' is the wordplay.
'science' becomes 'sc'.
'crowd' becomes 'rabble' (rabble is a kind of crowd).
'sc'+'rabble'='SCRABBLE'
'for' acts as a link.
(Other definitions for scrabble that I've seen before include "Scratch - grope - board game" , "Disorderly struggle" , "Word-building game" , "Clabbers in popular word game" , "Scratch or grope around" .)