Intelligence shown by bidders giving their opponents hiding (4)
I believe the answer is:
news
'intelligence' is the definition.
(I know that intelligence can be written as news)
I don't understand the remainder of the clue.
(Other definitions for news that I've seen before include "Noteworthy information" , "Sewn (anag.)" , "Fresh tidings" , "that's aired at six o'clock" , "Important information" .)