Survey (4)
'survey' is the definition.
(polling is a kind of surveying)
This is all the clue.
(Other definitions for poll that I've seen before include "Voting process; parrot" , "Voting as at an election" , "coverage of vote for 9d > [WHISTLE BLOWER]" , "less ambitious students" , "A vote; a head" .)
'survey' is the definition.
(both can mean an inspection)
This is all the clue.
(Other definitions for review that I've seen before include "Critical assessment as of play" , "Critical examination" , "Critical evaluation, of a book say" , "Write a critique of" , "A commentary by a critic" .)